Gray Crystals
Gray gemstones and crystals — 51 popular gray stones with photos and identification notes. Looking for gray crystal names for jewellery, collecting or a daily-carry stone? Start here, then test yourself in the crystal quiz.
Crystals that are gray
Stones get their gray colour from trace elements or inclusions, and the same mineral species can occur in several colours — so colour alone never confirms an identification. The most recognisable crystals and gemstones that are gray include Silver, Limestone, Borax, Granite, Bismuth, Basalt. Below is every gray stone in Gemdle with photos, Mohs hardness and how to tell them apart — pair it with the guided identifier to narrow down an unknown specimen.
Mainly gray stones & crystals
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Silver
Mohs 2.5–3
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Limestone
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Borax
Mohs 2–2.5
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Granite
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Bismuth
Mohs 2–2.5
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Basalt
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Marble
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Agate
Mohs 6.5–7
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Hematite
Mohs 5.5–6.5
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Flint
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Corundum
Mohs 9 (defining mineral)
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Talc
Mohs 1 (defining mineral)
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Pumice
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Chalcedony
Mohs 6–7
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Slate
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Shale
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Soapstone
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Chert
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Gneiss
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Galena
Mohs 2.5–2.75
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Labradorite
Mohs 6–6.5
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Dolomite
Mohs 3.5–4.0
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Schist
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Gabbro
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Rhyolite
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Stibnite
Mohs 2
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Breccia
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Smoky Quartz
Mohs 7 – lower in impure varieties (defining mineral)
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Conglomerate
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Iron Meteorite
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Tremolite
Mohs 5–6
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Marcasite
Mohs 6–6.5
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Albite
Mohs 6–6.5
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Arsenopyrite
Mohs 5.5–6
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Sillimanite
Mohs 7
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Cerussite
Mohs 3 to 3.5
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Larvikite
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Molybdenite
Mohs 1–1.5
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Nepheline
Mohs 6
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Pietersite
Mohs 7
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Glaucophane
Mohs 6.0–6.5
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Hypersthene
Mohs 5.5–6
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Antigorite
Mohs 3.5–4
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Leucite
Mohs 5.5–6
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Cobaltite
Mohs 5.5
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Pectolite
Mohs 4.5 – 5
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Acanthite
Mohs 2.0–2.5
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Oligoclase
Mohs 6 to 6.5
Stones that also occur in gray
These minerals are best known in other colours but are also found in gray — so a gray specimen is possible, though the photo here may show a different shade. Confirm the colour of the actual stone, not just the species.