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 241–360 of 805 gray rocks (page 3 of 7).
Feldsparcommonmineral · Mohs 6white, gray, pink
Ferchromideraremineral · Mohs 5-6silver-white, gray- No imageFerdowsiiteraremineral · Mohs 2gray, white
Fern Fossilcommonfossilblack, brown, gray
Ferrihollanditeraremineral · Mohs 6black, gray
Ferro-gedriteraremineral · Mohs 5-6dark brown, brownish black, gray
Ferroindialiteraremineral · Mohs 7-7.5brownish purple, gray
Ferroseliteraremineral · Mohs 6-6.5white, gray
Ferrosiliteraremineral · Mohs 5-6brown, dark brown, black- No imageFerroskutteruditeraremineral · Mohs 5.5-6tin-white, silver-white, gray
- No imageFerrostalderiteraremineral · Mohs 3.5-4black, gray
Fibrolitecommonmineral · Mohs 6.5-7.5white, colorless, gray
Finger Coralcommonfossil · Mohs 3-4white, tan, brown
Finnemaniteraremineral · Mohs 2.5-3gray, white, colorless
Fish Fossilcommonfossil · Mohs 3-5brown, tan, gray
Fishtail Selenitecommonmineral · Mohs 2colorless, white, yellowish
Fletcheriteraremineral · Mohs 4.5black, gray
Flintcommonmineral · Mohs 7gray, black, brown
Flint Nodulecommonmineral · Mohs 7gray, black, brown- No imageFlorenskyiteraremineral · Mohs 5-6white, gray
- No imageFluorbritholite-(Ce)raremineral · Mohs 5-5.5brown, reddish-brown, yellow
- No imageFluorcalciobritholiteraremineral · Mohs 5brown, yellow, gray
Fluoro-edeniteraremineral · Mohs 5-6white, gray, pale green
Fluoro-tremoliteuncommonmineral · Mohs 5-6white, colorless, pale green- No imageFluorocroniteraremineral · Mohs 3-4colorless, white, gray
Forsteritecommonmineral · Mohs 6.5-7green, yellow-green, colorless
Fort Payne Chertcommonmineral · Mohs 6.5-7white, gray, brown
Foshagiteraremineral · Mohs 3white, colorless, gray
Fossilcommonfossil · Mohs 3-7brown, gray, white
Fossil Coralcommonfossil · Mohs 6.5-7white, tan, brown
Fossil Leafcommonfossil · Mohs 2-4brown, black, gray
Fossil Leaf Printcommonfossil · Mohs 2-4brown, tan, black
Fossil Plantcommonfossilbrown, black, gray
Fossilized Coralcommonfossil · Mohs 6.5-7white, gray, brown
Fossilized Ferncommonfossil · Mohs 3-6black, brown, gray
Fossilized Horse Bonecommonfossil · Mohs 3-6brown, tan, white- No imageFossilized Quarrycommonfossilbrown, tan, gray
Fossilized Shark Toothcommonfossil · Mohs 3-5black, gray, brown
Fossilized Shellcommonfossil · Mohs 3-5white, gray, brown
Francolitecommonmineral · Mohs 5white, gray, yellow
Frohbergiteraremineral · Mohs 3.5white, pale rose, gray
Frooditeraremineral · Mohs 2.5gray
Fulguriteuncommonmineral · Mohs 6.5-7white, gray, tan
Gabrieliteraremineral · Mohs 2gray, black
Galliteraremineral · Mohs 3-3.5gray- No imageGanteriteraremineral · Mohs 4-4.5white, colorless, gray
- No imageGarmiteraremineral · Mohs 3.5white, colorless, gray
Garnet Schistcommonmetamorphic · Mohs 3-7gray, brown, silver
Gastrolithuncommonfossilvariable, brown, gray
Gastropodcommonfossil · Mohs 3-5white, brown, gray
Gastropod Fossilcommonfossilbrown, gray, white- No imageGatedaliteraremineral · Mohs 3.5-4gray
Gaylussiteuncommonmineral · Mohs 2.5-3colorless, white, gray
Gedriteuncommonmineral · Mohs 5-6brown, gray, green
Geeriteraremineral · Mohs 3.5-4black, gray
Geffroyiteraremineral · Mohs 3-4white, gray
Gehleniteuncommonmineral · Mohs 5.5-6gray, yellowish-brown, white
Geodecommonsedimentary · Mohs 7white, gray, brown
Gismondine-Cauncommonmineral · Mohs 4-5white, colorless, gray
Glauberitecommonmineral · Mohs 2.5-3colorless, white, yellow
Glaucodotraremineral · Mohs 5tin-white, silver-white, gray
Gneisscommonmetamorphic · Mohs 5-7white, gray, pink- No imageGold Quartzcommonmineral · Mohs 7white, gray, yellow
Goniatitecommonfossil · Mohs 3-4brown, gray, black
Gorceixiteuncommonmineral · Mohs 4.5-5.5white, colorless, yellow
Granitecommonigneous · Mohs 6-7white, gray, pink
Granitic Pegmatitecommonigneous · Mohs 6-7white, pink, gray
Granodioritecommonigneous · Mohs 6-7gray, white, black
Grape Agatecommonmineral · Mohs 6.5-7purple, violet, lavender
Graphic Granitecommonigneous · Mohs 6-7white, gray, pink- No imageGraţianiteraremineral · Mohs 3-3.5gray, black
Gray Agatecommonmineral · Mohs 6.5-7gray, gray, white- Gray Agatecommonmineral · Mohs 6.5-7gray, gray, white
Gray Baritecommonmineral · Mohs 3-3.5gray, white, colorless
Grayiteraremineral · Mohs 4white, yellowish, gray
Gregoryiteraremineral · Mohs 5white, gray, pale yellow
Greywackecommonsedimentary · Mohs 6-7gray, dark gray, brownish gray
Grumipluciteraremineral · Mohs 1.5-2gray, white
Gruneritecommonmineral · Mohs 5-6brown, greenish-brown, gray
Gypsitecommonsedimentary · Mohs 1.5-2white, gray, yellowish
Gypsumcommonmineral · Mohs 2colorless, white, gray- No imageHakite-(Cd)raremineral · Mohs 3-4gray, black
- No imageHakite-(Zn)raremineral · Mohs 3-4gray, black
Halloysitecommonmineral · Mohs 2-2.5white, off-white, gray
Hambergiteuncommonmineral · Mohs 7.5colorless, white, gray
Hanksiteraremineral · Mohs 3-3.5colorless, white, yellow- No imageHansblockiteraremineral · Mohs 2-2.5white, gray
Hardystoniteraremineral · Mohs 3white, gray, pink
Harkeriteraremineral · Mohs 5white, colorless, gray
Harmotomeuncommonmineral · Mohs 4.5white, gray, yellowish
Hatchiteraremineral · Mohs 3.5black, gray
Hatruriteraremineral · Mohs 3colorless, white, gray
Hectoriteuncommonmineral · Mohs 1-2white, gray, pink
Hedyphaneraremineral · Mohs 4-5white, yellowish, colorless- No imageHemusiteraremineral · Mohs 3.5gray
- No imageHeulandite-Srraremineral · Mohs 3-4white, colorless, gray
- No imageHexacelsianraremineral · Mohs 6white, colorless, gray
Hidalgoiteraremineral · Mohs 4-4.5white, colorless, yellow
Hillebranditeraremineral · Mohs 5white, colorless, gray- No imageHloušekiteraremineral · Mohs 2-3white, gray, pale yellow
Horn Coralcommonfossil · Mohs 3-4gray, tan, brown
Hornfelscommonmetamorphic · Mohs 5-7gray, dark gray, black
Horsetail Fossilcommonfossil · Mohs 3-5gray, brown, black
Howlitecommonmineral · Mohs 3.5white, gray, colorless
Humberstoniteraremineral · Mohs 2.5colorless, white, gray
Hyalotekiteraremineral · Mohs 5-5.5white, colorless, gray
Hydroboraciteuncommonmineral · Mohs 2-3white, colorless, gray
Hydrocerussiteraremineral · Mohs 3.5white, colorless, gray
Hydroglauberiteraremineral · Mohs 2-3colorless, white, gray
Hydrokenomicroliteraremineral · Mohs 5-5.5yellow, brown, colorless
Hydrotalcitecommonmineral · Mohs 2white, gray, pale green
Hydroxylellestaditeraremineral · Mohs 4.5-5colorless, white, gray
Hypersthenecommonmineral · Mohs 5-6black, dark brown, dark green
Ignimbritecommonigneous · Mohs 5-7gray, white, pink
Iimoriite-(Y)raremineral · Mohs 5-5.5white, gray, yellowish-white
Illitecommonmineral · Mohs 1-2white, gray, pale green
Impactiteuncommonsedimentary · Mohs 5-7black, brown, green- No imageIndigo Gabbrocommonigneous · Mohs 6-7black, dark purple, gray
Insizwaiteraremineral · Mohs 4-5white, gray- No imageIridosmineraremineral · Mohs 6-7tin-white, silver-white, gray
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