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 862 gray rocks and minerals.
Achondriterareigneous · Mohs 5-7gray, brown, black
Afghaniteraremineral · Mohs 5.5-6blue, colorless, white
Agatecommonmineral · Mohs 6.5-7white, gray, blue- No imageAgate Nodulescommonmineral · Mohs 6.5-7banded, white, gray
- No imageAgatized Algaecommonfossil · Mohs 6.5-7brown, red, tan
- No imageAgatized Clamscommonfossil · Mohs 6.5-7white, gray, brown
- No imageAgatized Coralcommonfossil · Mohs 6.5-7white, gray, pink
- No imageAgatized Cyad Woodcommonfossil · Mohs 6.5-7brown, red, white
- No imageAgatized Cycad Wooduncommonfossil · Mohs 6.5-7brown, tan, gray
- No imageAgatized Fern Budsuncommonfossil · Mohs 6.5-7brown, tan, gray
- No imageAgatized Fossil Shellscommonfossil · Mohs 6.5-7white, brown, red
Agatized Fossilscommonfossil · Mohs 6.5-7brown, red, yellow- No imageAgatized Limb Castsuncommonfossil · Mohs 6.5-7brown, red, yellow
- No imageAgatized 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
Akhtenskiteraremineral · Mohs 2-3black, gray
Aktashiteraremineral · Mohs 3-3.5gray, black
Alabastercommonmineral · Mohs 2white, colorless, gray
Albitecommonmineral · Mohs 6-6.5white, colorless, gray
Alibates Flintuncommonfossil · Mohs 6.5-7red, white, blue
Aliettiteraremineral · Mohs 1-2white, gray, yellowish- No imageAllabogdaniteraremineral · Mohs 6gray, white
Alstoniteraremineral · Mohs 4-4.5colorless, white, gray
Althausiteraremineral · Mohs 3.5colorless, white, gray
Alumoåkermaniteraremineral · Mohs 5-6colorless, white, gray
Alunitecommonmineral · Mohs 3.5-4white, gray, pink
Amiciteraremineral · Mohs 4.5white, colorless, gray
Aminoffiteraremineral · Mohs 4colorless, white, gray
Ammonitescommonfossil · Mohs 3-4brown, gray, black
Amygdaloidal Basaltcommonigneous · Mohs 5-6gray, black, green
Analcimecommonmineral · Mohs 5-5.5colorless, white, gray- No imageAnalcitecommonmineral · Mohs 5-5.5white, colorless, gray
Ancylite-(Ce)uncommonmineral · Mohs 4-4.5yellow, brown, reddish-brown
Andalusitecommonmineral · Mohs 7.5reddish-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
Aniliteraremineral · Mohs 3.5gray, dark gray, black
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- No imageAntimonseliteraremineral · Mohs 2gray, lead-gray
Aphthitaliteuncommonmineral · Mohs 3-3.5white, colorless, gray
Aramayoiteraremineral · Mohs 2.5black, gray
Ardaiteraremineral · Mohs 2.5gray, dark gray, black
Arkosecommonsedimentary · Mohs 6-7pink, gray, tan
Armalcoliteraremineral · Mohs 6gray, brownish-gray, black
Arrowheadscommonfossil · 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
Awaruiteraremineral · Mohs 5white, gray, yellow-white
Axinite-(Mg)raremineral · Mohs 6.5-7brown, violet, yellow
Baculitecommonfossil · Mohs 3-4brown, gray, beige
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- No imageBanded Opalcommonmineral · Mohs 5.5-6.5white, gray, brown
Barariteraremineral · Mohs 2.5-3colorless, white, gray
Baritecommonmineral · Mohs 3-3.5colorless, white, yellow
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 2silver-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- No imageBlue 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- No imageBoji 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 imageBornhardtiteraremineral · Mohs 4.5-5pinkish-white, gray
- No imageBoromulliteraremineral · Mohs 7white, colorless, gray
Borovskiteraremineral · Mohs 3-4white, gray
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 imageBrodtkorbiteraremineral · Mohs 3.5white, gray
- No imageBrontesiteraremineral · Mohs 2-3gray, white
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