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 601–720 of 744 gray rocks (page 6 of 7).
Opal-quartzcommonmineral · Mohs 6.5-7white, gray, brown- No imageOsarsiteraremineral · Mohs 6gray
Osumiliteraremineral · Mohs 5-5.5black, dark blue, dark brown
Ourayiteraremineral · Mohs 2gray
Ovamboiteraremineral · Mohs 3.5gray
Pääkköneniteraremineral · Mohs ~2gray- No imagePalladosilicideraremineral · Mohs 5-5.5silver-white, gray
Palygorskitecommonmineral · Mohs 2-2.5white, gray, brownish white- No imagePašavaiteraremineral · Mohs 2gray
Perlitecommonigneous · Mohs 5-5.5gray, white, greenish- No imagePertsevite-(F)raremineral · Mohs 5-6brown, colorless, gray
Petaliteuncommonmineral · Mohs 6.5colorless, gray, yellow
Petrified Coralcommonfossil · Mohs 6.5-7white, gray, brown- No imagePetroviciteraremineral · Mohs ~3gray
- No imagePetrukiteraremineral · Mohs 4.5gray, brown
Phosgeniteraremineral · Mohs 2-3white, gray, brownish yellow
Phosphoritecommonsedimentary · Mohs 3-5gray, brown, black- No imagePicasso Stonemetamorphicblack, gray, tan
Picromeritecommonmineral · Mohs 2.5white, colorless, gray- No imagePieczkaiteraremineral · Mohs 4-5gray
Pink Rhodonitecommonmineral · Mohs 5.5-6.5pink, reddish-pink, brown
Pirquitasiteraremineral · Mohs 4gray
Pitticiteuncommonmineral · Mohs 2-3yellow, gray, gray white
Platinum Nuggetraremineral · Mohs 4-4.5silvery-white, gray
Plumbogummiteuncommonmineral · Mohs 4.5-5white, gray, yellow
Plumbonacriteraremineral · Mohs 3.5white, colorless, gray
Plumbotelluriteraremineral · Mohs 2brown, gray, gray brown- No imagePolekhovskyiteraremineral · Mohs 5-6white, gray
- No imagePolkanoviteraremineral · Mohs 3.5gray
Polluciteuncommonmineral · Mohs 6.5-7colorless, white, gray
Polyhalitecommonmineral · Mohs 3.5colorless, gray, gray white- No imagePompom Agatecommonmineral · Mohs 6.5-7white, gray, brown
Powelliteuncommonmineral · Mohs 3.5-4blue, brown, green yellow
Proberiteuncommonmineral · Mohs 3.5white, colorless, gray
Proto-anthophylliteraremineral · Mohs 5.5-6gray, brown, green
Protozoa Agateuncommonfossil · Mohs 6.5-7brown, red, yellow- No imageProxidecagoniteraremineral · Mohs 6-7gray, black
Pseudorutileuncommonmineral · Mohs 5.5black, brown, red
Pseudowollastoniteraremineral · Mohs 4.5-5white, colorless, gray
Pyrosmalite-(Fe)raremineral · Mohs 4.5green blackish, pale liver brown, gray
Pyrosmalite-(Mn)raremineral · Mohs 4-4.5green blackish, pale liver brown, gray
Pyroxenecommonmineral · Mohs 5-6black, dark green, brown
Quadratiteraremineral · Mohs 3gray, reddish gray
Quartz Concretioncommonmineral · Mohs 7white, gray, brown
Quartz Geodecommonmineral · Mohs 7colorless, white, purple- No imageRadhakrishnaiteraremineral · Mohs 2-3gray, reddish brown
Rasvumiteraremineral · Mohs 4-5steel gray, brownish black, gray
Rayiteraremineral · Mohs 2.5lead gray, gray
Rhodplumsiteraremineral · Mohs 3-3.5gray- No imageRhomboclaseuncommonmineral · Mohs 2colorless, bluish, greenish
Rockcastle Conglomeratecommonsedimentary · Mohs 6-7gray, white, tan- No imageRogermitchelliteraremineral · Mohs 5colorless, gray
Rooseveltiteraremineral · Mohs 4-4.5gray, gray white- No imageRoquesiteraremineral · Mohs 3.5-4gray
Rosenbuschiteraremineral · Mohs 5-6orange, gray, brownish- No imageRuarsiteraremineral · Mohs 6-7gray, dark lead gray
- No imageSaddlebackiteraremineral · Mohs 4.5-5gray, black
Saffloriteuncommonmineral · Mohs 4.5-5tin white, gray, dark gray
Sakhaiteraremineral · Mohs 5colorless, gray, gray white
Sassoliteuncommonmineral · Mohs 1white, gray, yellow
Sazhinite-(Ce)raremineral · Mohs 2-3gray, gray white, pearl white- No imageScandiobabingtoniteraremineral · Mohs 6gray
- No imageSchöllhorniteraremineral · Mohs 1.5-2gray
Seinäjokiteraremineral · Mohs 5gray
Seleniumraremineral · Mohs 2gray, purple gray, reddish
Semenovite-(Ce)raremineral · Mohs 3.5-4brown, orange-brown, gray
Semseyiteuncommonmineral · Mohs 2.5black, gray- No imageSenandoriteraremineral · Mohs 3-4gray, dark gray, black
Senarmontiteuncommonmineral · Mohs 2-2.5white, colorless, gray
Sepiolitecommonmineral · Mohs 2-2.5grayish white, yellowish white, bluish green white
Siliceous Oolitecommonsedimentary · Mohs 6.5-7white, gray, tan
Silicified Agatecommonmineral · Mohs 6.5-7multicolored, white, gray
Silicified Coralcommonfossil · Mohs 6.5-7white, gray, brown
Silicified Fossilcommonfossil · Mohs 6.5-7brown, red, yellow
Silicified Mastodon Tuskrarefossil · Mohs 6.5-7white, cream, tan
Silicified Oolitecommonfossil · Mohs 6.5-7white, gray, brown
Silicified Pine Coneuncommonfossil · Mohs 6.5-7brown, tan, gray
Sphaerobertranditeraremineral · Mohs 5yellow, colorless, brownish white- No imageSphaerobismoiteraremineral · Mohs 4green, yellowish, gray
Spherocobaltiteraremineral · Mohs 4deep rose-red, red, may be surficially altered
Spherulitic Chertcommonmineral · Mohs 6.5-7white, gray, tan
Spongecommonfossil · Mohs 3-5white, gray, brown
Spurriteuncommonmineral · Mohs 5gray, gray white, lilac gray
Stibarsenraremineral · Mohs 3-4white, gray, grayish white
Stibiconitecommonmineral · Mohs 5.5-7brown, gray, lemon white
Stilleiteraremineral · Mohs ~5gray- No imageStillwateriteraremineral · Mohs 4.5gray
Stolziteuncommonmineral · Mohs 2.5-3reddish brown, yellowish brown, brown
Stromatoporoidcommonfossil · Mohs 3-5tan, brown, gray- No imageStronadelphiteraremineral · Mohs 5colorless, white, gray
Strontiochevkiniteraremineral · Mohs ~5brownish black, gray- No imageStrontiohurlbutiteraremineral · Mohs 6colorless, white, gray
Stütziteraremineral · Mohs 3.5gray, dark bronze
Sulphohaliteraremineral · Mohs ~3.5colorless, green yellow, gray
Svabiteraremineral · Mohs 4-5colorless, gray, gray green
Sweetwater Agatecommonmineral · Mohs 6.5-7clear, white, gray
Synchysite-(Ce)uncommonmineral · Mohs 4.5brown, gray, grayish yellow- No imageTausoniteraremineral · Mohs 6-6.5brown red, gray, dark red
Temagamiteraremineral · Mohs 2.5gray
Tephroiteuncommonmineral · Mohs 6reddish brown, gray, olive green
Teredo Petrified Woodcommonfossil · Mohs 6.5-7brown, tan, gray- No imageTetraferroplatinumraremineral · Mohs 4-5gray, silver white
Tiemanniteraremineral · Mohs 2.5gray, reddish brown, black
Tilasiteraremineral · Mohs 5violet gray, green, gray- No imageTistariteraremineral · Mohs 8.5blue, colorless, gray
- No imageTitanomaghemitecommonmineral · Mohs 5-6black, brownish-black, gray
Todorokitecommonmineral · Mohs 1.5black, brownish black, gray
Toyohaiteraremineral · Mohs 4gray
Tridymiteuncommonmineral · Mohs 7colorless, white, yellowish white
Trilobite Fossilcommonfossil · Mohs 3-5black, brown, gray
Triphyliteuncommonmineral · Mohs 4-5bluish gray, gray, brownish
Tripolicommonmineral · Mohs 1-2white, gray, yellow- No imageTsikourasiteraremineral · Mohs 4silver-white, gray
Tungsteniteraremineral · Mohs 2.5gray
Turritella Agatecommonfossil · Mohs 6.5-7brown, tan, gray
Uraniumraremineral · Mohs 6silvery-white, gray
Ustarasiteraremineral · Mohs 2.5gray, silver gray
Valleriiteuncommonmineral · Mohs <1bronze, gray- No imageVelikiteraremineral · Mohs 4gray, greenish gray, light gray
Vertebrate Fossilcommonfossil · Mohs 3-6brown, tan, black
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