Gray rocks & minerals
Gray rocks and minerals are extremely common in the field. Hardness, density, and how the specimen breaks (fracture vs. cleavage) tell you more than color alone.
Showing 1–120 of 805 gray rocks and minerals.
Achondriterareigneous · Mohs 5-7gray, brown, black
Afghaniteraremineral · Mohs 5.5-6blue, colorless, white
Agatecommonmineral · Mohs 6.5-7white, gray, blue
Agate Nodulecommonmineral · Mohs 6.5-7banded, white, gray
Agatized Algaecommonfossil · Mohs 6.5-7brown, red, tan- No imageAgatized Clamcommonfossil · Mohs 6.5-7white, gray, brown
Agatized Coralcommonfossil · Mohs 6.5-7white, gray, pink
Agatized Cycad Wooduncommonfossil · Mohs 6.5-7brown, tan, gray- No imageAgatized Fern Buduncommonfossil · Mohs 6.5-7brown, tan, gray
Agatized Fossilcommonfossil · Mohs 6.5-7brown, red, yellow
Agatized Fossil Shellcommonfossil · Mohs 6.5-7white, brown, red- No imageAgatized Limb Castuncommonfossil · Mohs 6.5-7brown, red, yellow
Agatized Palm Woodcommonfossil · Mohs 6.5-7brown, tan, gray
Agatized Woodcommonfossil · Mohs 6.5-7brown, red, yellow
Agrelliteraremineral · Mohs 5.5white, gray, pinkish
Åkermaniteuncommonmineral · Mohs 5-6colorless, white, gray- No imageAkhtenskiteraremineral · Mohs 2-3black, gray
- No imageAktashiteraremineral · Mohs 3-3.5gray, black
Alabastercommonmineral · Mohs 2white, colorless, gray
Albitecommonmineral · Mohs 6-6.5white, colorless, gray- No imageAlexkhomyakoviteraremineral · Mohs 3-4colorless, white, gray
Alibates Flintuncommonfossil · Mohs 6.5-7red, white, blue
Alstoniteraremineral · Mohs 4-4.5colorless, white, gray
Althausiteraremineral · Mohs 3.5colorless, white, gray
Alumoåkermaniteraremineral · Mohs 5-6colorless, white, gray
Amiciteraremineral · Mohs 4.5white, colorless, gray
Aminoffiteraremineral · Mohs 5.5colorless, white, gray
Ammonitecommonfossil · Mohs 3-4brown, gray, black
Amygdaloidal Basaltcommonigneous · Mohs 5-6gray, black, green
Analcimecommonmineral · Mohs 5-5.5colorless, white, gray
Ancylite-(Ce)uncommonmineral · Mohs 4-4.5yellow, brown, reddish-brown
Andalusitecommonmineral · Mohs 6.5reddish-brown, brown, pink
Andesinecommonmineral · Mohs 6-6.5white, gray, greenish
Andesitecommonigneous · Mohs 6-7gray, dark gray, brownish-gray- No imageAndreyivanoviteraremineral · Mohs 5-6white, gray
Anduoiteraremineral · Mohs 5-6white, gray
Anglesitecommonmineral · Mohs 2.5-3colorless, white, yellow
Anhydritecommonmineral · Mohs 3.5colorless, white, gray
Ankeritecommonmineral · Mohs 3.5-4white, yellow, brown
Anorthiteuncommonmineral · Mohs 6white, colorless, gray
Anorthositecommonigneous · Mohs 6white, gray, bluish-gray
Anthophyllitecommonmineral · Mohs 5.5-6brown, gray, white
Aphthitaliteuncommonmineral · Mohs 3-3.5white, colorless, gray
Aramayoiteraremineral · Mohs 2.5black, gray
Arkosecommonsedimentary · Mohs 6-7pink, gray, tan
Armalcoliteraremineral · Mohs 5gray, brownish-gray, black
Arrowheadcommonfossil · Mohs 6.5-7white, gray, brown
Arsenicuncommonmineral · Mohs 3.5tin-white, gray, black
Arsenolampriteraremineral · Mohs 2white, gray, black
Arsenopalladiniteraremineral · Mohs 3.5white, light yellow, gray
Asbestoscommonmineral · Mohs 2.5-3white, green, gray
Athabascaiteraremineral · Mohs 3silver-white, gray
Atokiteraremineral · Mohs 3.5-4silver-white, gray
Augen Gneisscommonmetamorphic · Mohs 5-7gray, pink, white
Aurostibiteraremineral · Mohs 3gray
Awaruiteraremineral · Mohs 5white, gray, yellow-white
Axinite-(Mg)raremineral · Mohs 6.5-7brown, violet, yellow
Baculitecommonfossil · Mohs 3-4brown, gray, beige- No imageBadaloviteraremineral · Mohs 7-7.5pale green, green, greenish gray
Balkaniteraremineral · Mohs 2.5-3black, gray- No imageBalmorhea Blue Agateuncommonmineral · Mohs 6.5-7blue, gray, white
Banalsiteraremineral · Mohs 6white, colorless, gray
Banded Agatecommonmineral · Mohs 6.5-7white, gray, blue
Banded Iron Formationcommonsedimentary · Mohs 5-7red, gray, black
Banded Opalcommonmineral · Mohs 5.5-6.5white, gray, brown
Barariteraremineral · Mohs 2.5-3colorless, white, gray
Baritecommonmineral · Mohs 3-3.5colorless, white, yellow- No imageBarquilliteraremineral · Mohs 4-4.5gray
Barringeriteraremineral · Mohs 5white, silver-white, gray
Barytocalciteraremineral · Mohs 4white, yellow, gray
Bassaniteraremineral · Mohs 3white, colorless, gray
Baumstarkiteraremineral · Mohs 2.5gray, black
Bauxitecommonsedimentary · Mohs 1-3red, brown, tan
Beidellitecommonmineral · Mohs 1-2white, yellow, gray
Belemnitecommonfossil · Mohs 3-4brown, black, gray- No imageBellidoiteraremineral · Mohs 2.5black, gray
Benstoniteraremineral · Mohs 3-4white, gray, brownish-yellow
Bentonitecommonsedimentary · Mohs 1-2white, cream, gray
Berliniteraremineral · Mohs 6.5colorless, white, gray
Berzelianiteraremineral · Mohs 2.7silver-white, gray
Beyeriteraremineral · Mohs 3yellow, yellowish-white, gray
Biggs Jaspercommonmineral · Mohs 6.5-7tan, brown, cream
Billingsleyiteraremineral · Mohs 2.5silver-white, gray
Bismiteraremineral · Mohs 4.5greenish yellow, yellow, gray
Bismocliteraremineral · Mohs 2.5white, gray, yellowish
Bismutiteuncommonmineral · Mohs 3yellow, gray, white
Bivalve Fossilcommonfossil · Mohs 3-5tan, brown, gray
Blastoidcommonfossilgray, brown, white
Blue Agatecommonmineral · Mohs 6.5-7blue, white, gray- No imageBlue Agate Geodecommonmineral · Mohs 6.5-7blue, white, gray
Blue Silicified Coraluncommonfossil · Mohs 6.5-7blue, gray, white
Bluestonecommonsedimentary · Mohs 3-7blue, gray, bluish-gray
Böhmitecommonmineral · Mohs 3-3.5white, gray, yellowish
Boji Stonescommonmineral · Mohs 3.5-4brown, gray, black
Boraciteuncommonmineral · Mohs 7-7.5colorless, white, gray
Boratecommonmineral · Mohs 2-4white, colorless, gray
Boraxcommonmineral · Mohs 2-2.5white, colorless, gray- No imageBoromulliteraremineral · Mohs 7white, colorless, gray
Borovskiteraremineral · Mohs 3-4white, gray- No imageBoscardiniteraremineral · Mohs 3-3.5gray
Botswana Agatecommonmineral · Mohs 6.5-7gray, white, brown
Boulder Opaluncommongemstone · Mohs 5.5-6.5black, white, gray
Boussingaultiteuncommonmineral · Mohs 2white, colorless, yellowish
Bowieiteraremineral · Mohs 3.5-4gray, white
Brachiopodcommonfossilgray, brown, white
Bradleyiteraremineral · Mohs 3-3.5white, colorless, gray
Brain Coralcommonfossil · Mohs 3-4white, tan, brown
Brazilian Agatecommonmineral · Mohs 6.5-7gray, white, brown
Brazilian Geodecommonmineral · Mohs 7purple, white, clear
Brecciacommonsedimentary · Mohs 3-7gray, brown, red
Bredigiteraremineral · Mohs 5.5-6colorless, white, gray
Brewsterite-Bararemineral · Mohs 5white, yellow, gray
Brewsterite-Sruncommonmineral · Mohs 5white, yellow, colorless
Britholite-(Y)raremineral · Mohs 5-5.5brown, yellow, gray- No imageBrontesiteraremineral · Mohs 2-3gray, white
Brucitecommonmineral · Mohs 2.5white, pale green, blue
Brunogeieriteraremineral · Mohs 5-6gray
Bryozoancommonfossil · Mohs 3-5white, gray, tan- No imageBuckhorniteraremineral · Mohs 2.5black, gray
Buddingtoniteraremineral · Mohs 5.5white, colorless, gray
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