KnowAgate
Chalcedony · Mohs 7
Banded chalcedony in almost every colour, traditionally the steadying stone that stops the swings.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Gemini
- Care
- 💧 Water safe
Free · 63 stones · Filterable
The Crystal Database
Every crystal on this site as a record rather than as an article. Filter by colour, by chakra, by element or by what you actually need, and see the mineral family, the hardness and the water verdict next to the tradition instead of buried three pages down.
Nothing matches all four filters. Loosen one — colour and purpose together are usually the pair that leaves nothing standing.
Alexandrite
Chrysoberyl
Green in daylight and red under lamplight, which is why it became the stone of the two-sided life.
Worth knowing: Genuine alexandrite is rarer than diamond. Nearly everything sold under the name is lab-grown alexandrite or colour-change synthetic corundum.
- Element
- Spirit
Amazonite
Feldspar · Mohs 6–6.5
Blue-green feldspar traditionally used for saying no without a fight.
- Element
- Water
- Zodiac
- Virgo
- Care
- 💧 Brief water only
Amber
Fossil resin · Mohs 2–2.5
Fossilised tree resin, warm to the touch, worn for protection and vitality for millennia.
- Chakra
- Solar Plexus & Sacral
- Element
- Fire
- Zodiac
- Leo
- Care
- 💧 Brief water only
Amethyst
Quartz · Mohs 7
The purple quartz people reach for first, kept by the bed for a quieter head at night.
- Element
- Air
- Care
- 💧 Water safe
Angelite
Anhydrite · Mohs 3–3.5
Chalky blue anhydrite, associated with comfort and a sense of company.
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Apatite
Apatite · Mohs 5
Blue-green and tied to motivation with a plan behind it rather than a burst of enthusiasm.
- Element
- Air
- Care
- 💧 Brief water only
Apophyllite
Phyllosilicate
Glassy clear pyramids that grow on basalt, kept for the sense of a room being aired out.
- Element
- Spirit
Aquamarine
Beryl · Mohs 7.5–8
Sea-blue beryl linked with saying the difficult thing calmly.
- Chakra
- Throat
- Element
- Water
- Care
- 💧 Water safe
Aragonite
Carbonate · Mohs 3.5–4
Rust-brown clustered carbonate, used for centring when you are stretched too thin.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Azurite
Copper carbonate · Mohs 3.5–4
Intense blue copper mineral linked with insight that arrives sideways.
- Chakra
- Third Eye
- Element
- Air
- Care
- 💧 Keep dry ⚠️ toxic
Black Onyx
Chalcedony · Mohs 7
Solid black and traditionally a boundary stone, for holding a line without argument.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Capricorn
- Care
- 💧 Water safe
Black Tourmaline
Tourmaline · Mohs 7–7.5
The standard protection stone. Kept by doorways, desks and beds to catch what comes in.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Taurus
- Care
- 💧 Brief water only
Bloodstone
Chalcedony · Mohs 7
Dark green flecked with red, an old warrior's stone tied to stamina and steady courage.
- Element
- Fire
- Zodiac
- Pisces
- Care
- 💧 Water safe
Blue Lace Agate
Quartz (chalcedony)
Pale blue banded agate, the gentlest of the throat stones and a common gift for anxious talkers.
Blue Obsidian
Volcanic glass
Translucent blue glass used for speaking plainly when the stakes are high.
Worth knowing: Natural blue obsidian is extremely rare. Almost all bright blue obsidian on the market is manufactured glass.
- Element
- Water
Blue Tiger's Eye
Quartz
Also sold as hawk's eye. The same fibrous quartz as tiger's eye, but blue and much less pushy.
- Element
- Air
Cacoxenite
Phosphate inclusion
Golden needles growing inside amethyst or quartz, sold as a stone of large-scale change.
Worth knowing: Cacoxenite is an inclusion rather than a standalone crystal. What is sold as cacoxenite is host quartz or amethyst with the mineral growing inside it.
Calcite
Carbonate · Mohs 3
Soft carbonate in orange, yellow, white or green, used for a gentle lift and a change of air.
- Element
- Air
- Care
- 💧 Keep dry
Carnelian
Chalcedony · Mohs 7
Burnt orange and associated with starting things. The stone of the person who keeps almost beginning.
- Chakra
- Sacral
- Element
- Fire
- Care
- 💧 Water safe
Celestite
Sulfate · Mohs 3–3.5
Pale sky-blue crystals, tied to a very quiet kind of stillness.
- Element
- Air
- Care
- 💧 Keep dry
Cherry Quartz
Glass
Pink-red and cloudy, used for lifting the mood of a heart that has gone flat.
Worth knowing: Cherry quartz is manufactured glass, not a natural quartz variety. It is still popular, but it is not a mineral.
Chrysocolla
Copper silicate · Mohs 2.5–3.5
Blue-green copper silicate, the stone for a softer voice in a hard conversation.
- Element
- Water
- Care
- 💧 Keep dry ⚠️ toxic
No guide on site yet What it pairs with
Chrysoprase
Chalcedony · Mohs 7
Apple-green chalcedony, the hope stone, associated with a heart that starts working again.
- Chakra
- Heart
- Element
- Water
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Citrine
Quartz · Mohs 7
Warm yellow quartz tied to money and nerve, and the most commonly treated stone in the trade.
Worth knowing: Most commercial citrine is amethyst that has been heat-treated to turn yellow. Natural citrine is paler and much rarer.
- Chakra
- Solar Plexus
- Element
- Fire
- Care
- 💧 Water safe
Clear Quartz
Quartz · Mohs 7
The blank stone. It holds no agenda of its own, which is why it is used to strengthen whatever sits beside it.
- Chakra
- Crown
- Element
- Spirit
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Dalmatian Jasper
Feldspar rock
Cream with black spots, the stone people buy for children and for their own sense of humour.
Worth knowing: Dalmatian jasper is not a jasper. It is a feldspar-rich igneous rock, and the black spots are usually arfvedsonite rather than tourmaline.
- Element
- Earth
Emerald
Beryl · Mohs 7.5–8
Green beryl, the stone of loyalty and the long view of love rather than the first spark.
- Chakra
- Heart
- Element
- Earth
- Zodiac
- Taurus
- Care
- 💧 Keep dry
Fluorite
Fluorite · Mohs 4
Banded purple, green and blue. The desk stone, associated with order and clear thinking.
- Element
- Air
- Care
- 💧 Brief water only
Garnet
Garnet · Mohs 6.5–7.5
Deep red and tied to appetite: passion, commitment and the energy to chase something.
- Chakra
- Root
- Element
- Fire
- Care
- 💧 Water safe
Green Aventurine
Quartz · Mohs 7
Green quartz flecked with mica, carried for luck of the ordinary, unspectacular kind.
- Chakra
- Heart
- Element
- Earth
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Hematite
Iron oxide · Mohs 5–6
Metallic grey and heavy in the hand, the most literal grounding stone on the shelf.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Keep dry
Herkimer Diamond
Quartz
Doubly terminated quartz from Herkimer County, New York, so clear it was mistaken for diamond.
Worth knowing: A Herkimer diamond is quartz, not diamond. It sits at 7 on the Mohs scale rather than 10.
- Element
- Spirit
Howlite
Borate · Mohs 3.5
Chalk-white with grey veining, and traditionally the patience stone.
Worth knowing: Dyed howlite is the most common turquoise substitute on the market. If a blue stone is cheap, evenly coloured and scratches easily, this is usually what it is.
- Chakra
- Crown
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Iolite
Cordierite
Violet-blue and dramatically different from each angle, which is how Norse sailors are said to have used it.
Worth knowing: Iolite is strongly pleochroic: it shows blue, violet and near-colourless depending on the viewing angle. That is a real optical property, not a trick of the setting.
Jade
Jadeite / Nephrite
Carved for four thousand years in China and in Mesoamerica as the stone of a well-lived life.
Worth knowing: Jade is two different minerals: jadeite and nephrite. Both are genuine jade. Serpentine, aventurine and dyed quartz are frequently sold as jade and are not.
Jasper
Chalcedony · Mohs 7
Opaque, earthy and patterned, valued for endurance rather than for any quick effect.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Kunzite
Spodumene
Pale pink spodumene with a strong lengthwise sheen, tied to opening a guarded heart.
Worth knowing: Kunzite fades in sunlight and cleaves easily along one plane, so a knock in the wrong direction can split it.
Kyanite
Kyanite · Mohs 4.5–7
Blue blades, traditionally used to straighten the line between what you think and what you say.
- Element
- Air
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Labradorite
Feldspar · Mohs 6–6.5
Grey until the light hits it, then blue and gold. Tied to intuition and to change already underway.
- Element
- Air
- Zodiac
- Scorpio · Sagittarius
- Care
- 💧 Brief water only
Lapis Lazuli
Rock (lazurite) · Mohs 5–5.5
Ultramarine flecked with pyrite, an ancient stone of wisdom and plain speech.
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Larimar
Pectolite · Mohs 4.5–5
Caribbean blue pectolite, found only in the Dominican Republic, tied to the sense that it will pass.
- Chakra
- Throat
- Element
- Water
- Care
- 💧 Brief water only
Lepidolite
Mica · Mohs 2.5–3
Lilac mica that genuinely contains lithium, and traditionally the anxiety stone.
- Element
- Water
- Care
- 💧 Keep dry
Malachite
Copper carbonate · Mohs 3.5–4
Banded green copper carbonate, tied to transformation. Toxic, and best kept polished and dry.
Worth knowing: Malachite is a copper carbonate. Its dust is toxic and any water it has soaked in is unsafe to drink.
- Chakra
- Heart
- Element
- Earth
- Care
- 💧 Keep dry ⚠️ toxic
No guide on site yet What it pairs with
Moldavite
Tektite glass · Mohs 5.5
Green glass formed by a meteorite impact, with a reputation for rearranging lives fast.
Worth knowing: Moldavite is a tektite, glass formed by a meteorite impact about 15 million years ago, and it is one of the most faked stones sold. Green bottle glass is the usual substitute.
- Element
- Spirit
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Moonstone
Feldspar · Mohs 6–6.5
White with a floating sheen, linked to cycles, patience and your own timing.
- Element
- Water
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Moss Agate
Quartz (chalcedony)
Clear chalcedony with green mineral growth inside that looks like moss. The gardener's stone.
Worth knowing: The green is not plant matter. It is chlorite or hornblende that grew in dendritic, plant-like shapes.
Mother of Pearl
Nacre (organic)
The iridescent lining of a shell, worn as a protective and motherly charm in coastal cultures.
Worth knowing: Mother of pearl is organic, made of aragonite platelets laid down by a mollusc. Acids, perfume and vinegar etch it.
- Element
- Water
Obsidian
Volcanic glass · Mohs 5–5.5
Black volcanic glass, used both as a shield and as a mirror you may not enjoy looking into.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Scorpio
- Care
- 💧 Water safe
Opal
Silica (hydrated) · Mohs 5.5–6.5
Iridescent and famously changeable, said to amplify whatever mood you already brought.
Worth knowing: Opal is a hydrated silica gel rather than a crystal, and it can craze and crack if it dries out.
- Element
- Water
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Opalite
Glass
Milky and blue-glowing against the light, popular for transitions and for how it looks.
Worth knowing: Opalite is man-made opalescent glass. It is not opal, not moonstone and not a mineral, and honest sellers say so.
- Element
- Spirit
Pyrite
Iron sulfide · Mohs 6–6.5
Brassy gold cubes, fool's gold, traditionally the stone of nerve in money matters.
- Chakra
- Solar Plexus
- Element
- Fire
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Rhodochrosite
Carbonate · Mohs 3.5–4
Pink banded manganese carbonate, associated with tenderness towards your younger self.
- Element
- Water
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Rhodonite
Silicate · Mohs 5.5–6.5
Pink shot through with black manganese, tied to forgiveness of the slow, practical sort.
- Chakra
- Heart
- Element
- Earth
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Rose Quartz
Quartz · Mohs 7
Soft pink and everywhere, because it is the stone of gentleness towards other people and towards yourself.
- Chakra
- Heart
- Element
- Water
- Care
- 💧 Water safe
Selenite
Gypsum · Mohs 2
Translucent white gypsum, used to clear rather than to add. It dissolves in water.
- Chakra
- Crown
- Element
- Spirit
- Care
- 💧 Keep dry
Shungite
Carbon · Mohs 3.5–4
Black carbon rock from Karelia, traditionally the purifier and filter stone.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Smoky Quartz
Quartz · Mohs 7
Brown-grey quartz used as a floor rather than a lift, for days when everything feels airborne.
- Chakra
- Root
- Element
- Earth
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Sodalite
Sodalite · Mohs 5.5–6
Deep blue veined with white, the stone of cool logic and honest self-assessment.
- Element
- Air
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Sugilite
Cyclosilicate
Deep magenta-purple, only identified in 1944, and traditionally given to people who absorb the mood of a room.
- Element
- Spirit
Sunstone
Feldspar · Mohs 6–6.5
Warm orange with copper glitter, the daylight stone, carried for mood and confidence.
- Chakra
- Sacral & Solar Plexus
- Element
- Fire
- Care
- 💧 Brief water only
No guide on site yet What it pairs with
Tiger's Eye
Quartz · Mohs 7
Golden banded quartz with a moving stripe of light, tied to nerve that keeps its eyes open.
- Chakra
- Solar Plexus
- Element
- Fire
- Care
- 💧 Water safe
No guide on site yet What it pairs with
Turquoise
Turquoise · Mohs 5–6
Sky blue to green, carried for thousands of years as a travelling and protection stone.
- Chakra
- Throat
- Element
- Air
- Care
- 💧 Keep dry
No guide on site yet What it pairs with
Browse the whole database
Every group below is a page of its own, generated from the same records you just filtered. They are the lists people actually search for: the green heart stones, the throat-chakra blues, the stones for anxiety, the ones you can put in water.
By colour
By what you need
By zodiac sign
Sign correspondences come from this site's own twelve zodiac-crystal guides, so those articles stay the full answer rather than being duplicated here.
♑ Capricorn♒ Aquarius♓ Pisces♈ Aries♉ Taurus♊ Gemini♋ Cancer♌ Leo♍ Virgo♎ Libra♏ Scorpio♐ Sagittarius
By birth month
Birthstones follow the modern official list. Each month links its full guide.
January GarnetFebruary AmethystMarch Aquamarine, BloodstoneApril DiamondMay EmeraldJune Pearl, Alexandrite, MoonstoneJuly RubyAugust Peridot, Spinel, SardonyxSeptember SapphireOctober Opal, TourmalineNovember Topaz, CitrineDecember Turquoise, Tanzanite, Zircon
What is fact here and what is tradition
The two are kept in separate files and labelled separately on every card, because they are not the same kind of claim. The mineral family, the Mohs hardness, the colour range, the water and sunlight verdicts and the "worth knowing" notes are checkable physical fact, sourced from standard mineralogical and gemmological references. The chakra, element and intention associations are tradition: the correspondences published across the modern crystal-healing literature, offered as a prompt for reflection. None of it is medical advice.
Where the trade quietly disagrees with the label, the card says so. Most citrine is heat-treated amethyst. Cherry quartz and opalite are manufactured glass. Dalmatian jasper is not a jasper, a Herkimer diamond is quartz, and most blue obsidian never came out of a volcano. 40 of the 63 entries link a full guide on this site.
How to use this with the other crystal tools
The database answers "which stones", the other two answer "and then what". Every card links straight through: the safety checker for whether it can go in water, sun or salt, and the pairing checker for whether it works with the one already on your shelf. If you would rather start from a feeling than from a stone, the crystal finder asks what you need and picks for you.