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 862 gray rocks (page 6 of 8).
Petrified Cycaduncommonfossil · Mohs 6.5-7brown, tan, black
Petrified Palmcommonfossil · Mohs 6.5-7brown, tan, black
Petrified Palm Woodcommonfossil · Mohs 6.5-7tan, brown, black
Phacopscommonfossil · Mohs 3-5brown, gray, black
Phantom Quartzcommonmineral · Mohs 7colorless, white, gray
Phosgeniteraremineral · Mohs 2.5-3colorless, white, gray
Phosphoritecommonsedimentary · Mohs 3-5gray, brown, black
Pietersiteuncommonmineral · Mohs 6.5-7blue, gold, brown
Pink Rhodonitecommonmineral · Mohs 5.5-6.5pink, reddish-pink, brown
Pirquitasiteraremineral · Mohs 3.5-4black, gray
Plagioclasecommonmineral · Mohs 6-6.5white, gray, colorless
Plant Fossilcommonfossilbrown, black, gray
Platinum Nuggetsraremineral · Mohs 4-4.5silvery-white, gray
Plumboferriteraremineral · Mohs 5-6black, gray
Plumbogummiteuncommonmineral · Mohs 4-5colorless, white, gray
Plumbophylliteraremineral · Mohs 2-3white, colorless, gray
Plume Agatecommonmineral · Mohs 6.5-7white, gray, brown
Polariteraremineral · Mohs 4-5white, gray- No imagePolekhovskyiteraremineral · Mohs 5-6white, gray
Polhemusiteraremineral · Mohs 3.5white, gray
Polluciteuncommonmineral · Mohs 6.5colorless, white, gray
Polydymiteraremineral · Mohs 4.5-5.5gray, grayish-white
Polyhalitecommonmineral · Mohs 2.5-3colorless, white, gray- No imagePompom Agatecommonmineral · Mohs 6.5-7white, gray, brown
Powelliteuncommonmineral · Mohs 3.5yellow, brown, greenish-yellow
Prehnitecommonmineral · Mohs 6-6.5green, yellow-green, white- No imagePříbramiteraremineral · Mohs 3-3.5gray, white
Priday Thundereggcommonfossil · Mohs 6.5-7red, brown, white- No imageProberiteuncommonmineral · Mohs 3.5white, colorless, gray
Probertiteuncommonmineral · Mohs 3.5colorless, white, gray
Prosopiteraremineral · Mohs 4.5white, colorless, gray
Proto-anthophylliteraremineral · Mohs 5.5-6gray, brown, green- No imageProtoenstatiteraremineral · Mohs 5.5colorless, white, gray
- No imageProtozoa Agateuncommonfossil · Mohs 6.5-7brown, red, yellow
- No imageProxidecagoniteraremineral · Mohs 6-7silver, gray
- No imagePseudomarkeyiteraremineral · Mohs 3white, colorless, gray
Pseudowollastoniteraremineral · Mohs 4.5-5white, colorless, gray
Psilomelanecommonmineral · Mohs 5-6black, bluish-black, gray
Puddingstonecommonsedimentarymulticolored, gray, red
Pumicecommonigneous · Mohs 5.5-6white, gray, cream- No imagePutziteraremineral · Mohs 2.5-3gray, silver-white
Pyromorphiteuncommonmineral · Mohs 3.5-4green, yellow, brown
Pyrophyllitecommonmineral · Mohs 1-2white, gray, pale green
Pyroxenecommonmineral · Mohs 5-6black, dark green, brown
Quartzcommonmineral · Mohs 7colorless, white, gray- No imageQuartz Concretionscommonmineral · Mohs 7white, gray, brown
Quartz Geodecommonmineral · Mohs 7colorless, white, purple
Quartzitecommonmetamorphic · Mohs 7white, gray, pink- No imageRadhakrishnaiteraremineral · Mohs 2-3white, gray
Ramsdelliteuncommonmineral · Mohs 3black, gray
Rectoriteuncommonmineral · Mohs 2-3white, gray, yellowish
Rhabdophane-(Ce)uncommonmineral · Mohs 3.5white, yellow, pink
Rhabdophane-(La)raremineral · Mohs 3.5white, gray, yellowish- No imageRhabdophane-(Nd)raremineral · Mohs 3.5pink, white, yellow
Rhabdophane-(Y)raremineral · Mohs 3.5white, gray, yellow
Rheniiteraremineral · Mohs 1.5-2black, gray
Rhodostanniteraremineral · Mohs 4black, gray- No imageRhomboclaseuncommonmineral · Mohs 2colorless, white, gray
Rhyolitecommonigneous · Mohs 6-7gray, pink, tan- No imageRoalditeraremineral · Mohs 5.5white, gray
Rock Gypsumcommonmineral · Mohs 2white, gray, colorless
Rockcastle Conglomeratecommonsedimentary · Mohs 6-7gray, white, tan- No imageRohaiteraremineral · Mohs 3-4white, gray
Romanèchitecommonmineral · Mohs 5-6black, gray- No imageRuarsiteraremineral · Mohs 5-6silver-white, gray
- No imageRudashevskyiteraremineral · Mohs 3.5-4gray
Rugose Coralcommonfossil · Mohs 3-4white, gray, brown- No imageRumoiiteraremineral · Mohs 3.5white, gray
Sabatieriteraremineral · Mohs 2-3silver-white, gray
Saffloriteuncommonmineral · Mohs 4.5-5tin-white, silver-white, gray- No imageSakuraiiteraremineral · Mohs 3.5-4gray, black
Salammoniacuncommonmineral · Mohs 1.5-2white, yellow, gray
Sand Dollar Fossilcommonfossil · Mohs 3white, tan, gray
Sandstonecommonsedimentary · Mohs 6-7tan, brown, yellow
Sanidinecommonmineral · Mohs 6colorless, white, gray
Saponitecommonmineral · Mohs 2white, gray, yellowish
Sapphirineraremineral · Mohs 7.5blue, blue-green, green
Sassoliteuncommonmineral · Mohs 1white, colorless, yellowish
Satin Sparcommonmineral · Mohs 2white, colorless, gray
Scapolitecommonmineral · Mohs 5.5-6colorless, white, gray
Schistcommonmetamorphic · Mohs 3-6silver, gray, black
Sea Urchin Fossilcommonfossil · Mohs 3-5white, gray, tan
Searlesiteuncommonmineral · Mohs 3.5white, colorless, gray
Selenitecommonmineral · Mohs 2colorless, white, gray
Seleniumraremineral · Mohs 2gray, red- No imageSelenojalpaiteraremineral · Mohs 2.5black, gray
- No imageSenandoriteraremineral · Mohs 3-4gray, dark gray, black
Senarmontiteuncommonmineral · Mohs 2.5white, colorless, gray
Sepiolitecommonmineral · Mohs 2-2.5white, gray, yellow
Septarian Nodulescommonsedimentary · Mohs 3-5brown, yellow, gray
Serendibiteraremineral · Mohs 6.5-7blue, blue-green, black
Shalecommonsedimentary · Mohs 2-3gray, black, red
Shark Teethcommonfossil · Mohs 3-5black, brown, gray
Shocked Quartzraremineral · Mohs 7clear, white, gray- No imageShuangfengiteraremineral · Mohs 5.5silver-white, gray
Sibirskiteraremineral · Mohs 3-4white, colorless, gray
Siderazotraremineral · Mohs 3-4black, gray
Sideritecommonmineral · Mohs 3.5-4yellow, brown, gray- No imageSiliceous Oolitecommonsedimentary · Mohs 6.5-7white, gray, tan
- No imageSilicified Agatecommonfossil · Mohs 6.5-7multicolored, white, gray
Silicified Algaecommonfossil · Mohs 6.5-7tan, brown, gray
Silicified Coralcommonfossil · Mohs 6.5-7white, gray, brown- No imageSilicified Fernscommonfossil · Mohs 6.5-7brown, black, gray
Silicified Fossilscommonfossil · Mohs 6.5-7brown, red, yellow- No imageSilicified Lignitecommonfossil · Mohs 6.5-7brown, black, gray
- No imageSilicified Mastodon Tusksrarefossil · Mohs 6.5-7white, cream, tan
- No imageSilicified Oolitecommonfossil · Mohs 6.5-7white, gray, brown
- No imageSilicified Pine Conesuncommonfossil · Mohs 6.5-7brown, tan, gray
- No imageSilicified Woodcommonfossil · Mohs 6.5-7brown, red, yellow
Silkstonecommonmineral · Mohs 7white, gray, yellow
Sillimanitecommonmineral · Mohs 6.5-7.5white, colorless, gray
Siltstonecommonsedimentary · Mohs 3-4gray, red, brown
Silveruncommonmineral · Mohs 2.5-3silver-white, gray, black- No imageSilvialiteraremineral · Mohs 5-6white, colorless, gray
Sinneriteraremineral · Mohs 3.5gray, black
Sinoiteraremineral · Mohs 5.5white, colorless, gray
Skinneriteraremineral · Mohs 2.5-3gray, black
Skutteruditeuncommonmineral · Mohs 5.5-6tin-white, silver-white, gray
Slatecommonmetamorphic · Mohs 2.5-4gray, black, green
Slawsoniteraremineral · Mohs 6colorless, white, gray
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