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 121–240 of 862 gray rocks (page 2 of 8).
Brucitecommonmineral · Mohs 2.5white, pale green, blue
Bryozoancommonfossil · Mohs 3-5white, gray, tan- No imageBuckhorniteraremineral · Mohs 2.5black, gray
Buddingtoniteraremineral · Mohs 5.5white, colorless, gray
Burbankiteraremineral · Mohs 3.5yellow, pink, white
Burkeiteraremineral · Mohs 3.5white, gray, pale yellow
Bustamiteuncommonmineral · Mohs 5.5-6.5pink, reddish-pink, brownish-pink- No imageByruditeraremineral · Mohs 5.5colorless, white, gray
Bytowniteuncommonmineral · Mohs 6-6.5white, gray, yellowish
Cactus Quartzuncommonmineral · Mohs 7purple, white, yellow
Calciboriteraremineral · Mohs 6.5colorless, white, gray- No imageCalcified Coralcommonfossil · Mohs 3-4white, brown, tan
- No imageCalcio-olivineraremineral · Mohs 6white, colorless, gray
- No imageCalcite Nodulescommonmineral · Mohs 3white, yellow, gray
Calcjarliteraremineral · Mohs 4colorless, white, gray
Calomelraremineral · Mohs 1.5-2white, yellowish-white, gray
Calymenecommonfossilgray, brown, tan
Cancriniteuncommonmineral · Mohs 5-6yellow, orange, white
Cancrisiliteraremineral · Mohs 5-6colorless, white, gray
Carbonatiterareigneous · Mohs 3-4white, gray, tan
Carlsbergiteraremineral · Mohs 3.5silver-white, gray
Cassiteritecommonmineral · Mohs 6-7black, brown, reddish-brown
Caswellsilveriteraremineral · Mohs 3.5black, gray
Cat's Eye Quartzuncommongemstone · Mohs 7gray, yellow, green- No imageCatamarcaiteraremineral · Mohs 3-3.5gray, black
Cave Pearlscommonmineral · Mohs 3white, cream, gray
Celestinecommonmineral · Mohs 3-3.5colorless, white, pale blue
Celestitecommonmineral · Mohs 3-3.5colorless, white, pale blue
Celsianraremineral · Mohs 6white, colorless, yellow
Cerargyriteuncommonmineral · Mohs 1.5colorless, white, gray
Cerite-(CeCa)raremineral · Mohs 5.5brown, reddish-brown, gray
Cerussitecommonmineral · Mohs 3-3.5colorless, white, gray
Cervantiteuncommonmineral · Mohs 4-5yellow, white, gray- No imageCervelleiteraremineral · Mohs 2.5gray, black
Chalcedonycommonmineral · Mohs 6.5-7white, gray, blue- No imageChalcedony Geodecommonmineral · Mohs 6.5-7white, gray, blue
- No imageChalcedony Nodulescommonmineral · Mohs 6.5-7white, gray, blue
Chalkcommonsedimentary · Mohs 1white, off-white, gray- No imageChangchengiteraremineral · Mohs 3.5gray, white
Chaoiteraremineral · Mohs 1-2white, gray- No imageCharlevoix Stonecommonfossil · Mohs 3-4gray, white, beige
Charnockitecommonigneous · Mohs 6-7gray, greenish, brown- No imageChenmingiteraremineral · Mohs 6black, gray
Chertcommonmineral · Mohs 6.5-7white, gray, brown- No imageChert Nodulescommonmineral · Mohs 6.5-7gray, brown, black
Chiastolitecommonmineral · Mohs 6.5-7.5gray, yellowish-brown, reddish-brown
Chkaloviteraremineral · Mohs 6colorless, white, gray
Chlorargyriteuncommonmineral · Mohs 1.5-2.5white, gray, yellow
Chloritoidcommonmineral · Mohs 6.5dark green, gray, blackish-green
Chondritecommonigneous · Mohs 5-6gray, brown, black
Chrysotilecommonmineral · Mohs 2.5-3white, green, gray
Chrysotile Asbestoscommonmineral · Mohs 2.5-3white, gray, green- No imageClam Geodecommonfossil · Mohs 6.5-7white, gray, brown
Claystonecommonsedimentary · Mohs 1-2gray, brown, red- No imageClear Agatecommonmineral · Mohs 6.5-7colorless, white, gray
Cleavelanditecommonmineral · Mohs 6white, colorless, pale blue
Clino-ferro-suenoiteraremineral · Mohs 5-6brown, yellowish-brown, gray- No imageClinoenstatiteraremineral · Mohs 5-6white, gray, colorless
Clinokurchatoviteraremineral · Mohs 4-5brown, gray, yellowish-brown
Clinoptilolite-Nacommonmineral · Mohs 3.5-4white, colorless, gray
Clinozoisitecommonmineral · Mohs 6-7colorless, white, gray
Cobaltiteuncommonmineral · Mohs 5.5silver-white, reddish-white, gray
Coesiteraremineral · Mohs 7.5colorless, white, gray- No imageColdwater Agatecommonmineral · Mohs 6.5-7gray, white, yellow
Colemaniteuncommonmineral · Mohs 4.5colorless, white, gray- No imageCollophanecommonmineral · Mohs 5white, gray, yellow
Colorado Yule Marblecommonmetamorphic · Mohs 3-4white, gray
Common Opalcommonmineral · Mohs 5.5-6.5white, gray, yellow
Concretioncommonsedimentary · Mohs 3-7brown, gray, tan
Concretions With Fossilscommonfossil · Mohs 3-5brown, gray, tan
Condor Agatecommonmineral · Mohs 6.5-7red, orange, yellow
Congoliteraremineral · Mohs 7white, colorless, gray
Coral Fossilcommonfossil · Mohs 6.5-7white, tan, brown
Cordieritecommonmineral · Mohs 7-7.5blue, violet, gray
Cordylite-(Ce)raremineral · Mohs 4.5yellow, brown, gray
Coronaditeuncommonmineral · Mohs 4.5-5black, gray
Corrensiteuncommonmineral · Mohs 2-3green, yellow, white- No imageCossaitecommonmineral · Mohs 7white, gray
Crandalliteuncommonmineral · Mohs 5white, colorless, yellow
Crazy Lace Agatecommonmineral · Mohs 6.5-7white, gray, yellow
Criddleiteraremineral · Mohs 3-3.5gray
Crinoid Stemscommonfossil · Mohs 3-4gray, white, tan
Crinoidal Limestonecommonsedimentary · Mohs 3gray, tan, white
Crinoidscommonfossil · Mohs 3-4gray, white, tan
Cristobaliteuncommonmineral · Mohs 6.5white, colorless, gray- No imageCrocodile Toothcommonfossil · Mohs 3-5brown, tan, black
- No imageCryptochalcitecommonmineral · Mohs 3white, colorless, gray
Cryptomelanecommonmineral · Mohs 6-6.5black, gray
Cummingtoniteuncommonmineral · Mohs 5-6brown, gray, greenish-gray
Cuproiridsiteraremineral · Mohs 5.5-6gray, white
Cuprorhodsiteraremineral · Mohs 5-6gray, white
Dalnegorskiteraremineral · Mohs 4.5-5white, colorless, gray
Daubréeiteraremineral · Mohs 2.5white, gray, yellowish-white
Davyneraremineral · Mohs 5.5-6white, colorless, yellow
Dawsoniteuncommonmineral · Mohs 3white, colorless, gray
Dendritic Agatecommonmineral · Mohs 6.5-7white, colorless, gray
Diasporeuncommonmineral · Mohs 6.5-7white, gray, colorless
Dieneriteraremineral · Mohs 3.5silver-white, gray
Dinosaur Bonescommonfossil · Mohs 5.5-7brown, red, black
Dinosaur Coproliteuncommonfossil · Mohs 3-5brown, tan, black
Dinosaur Toothcommonfossil · Mohs 3-5brown, black, gray
Diopsidecommonmineral · Mohs 5.5-6.5white, gray, green
Dioritecommonigneous · Mohs 6-7gray, black, white- No imageDogtooth Calcitecommonmineral · Mohs 3white, colorless, yellow
Dolomitecommonmineral · Mohs 3.5-4white, gray, pink
Dolostonecommonsedimentary · Mohs 3.5-4gray, white, buff- No imageDrusy Quartzcommonmineral · Mohs 7colorless, white, gray
Dunham Dolomitecommonsedimentary · Mohs 3.5-4gray, buff, tan
Dzharkeniteraremineral · Mohs 3.5-4gray, blackish-gray- No imageDzierżanowskiteraremineral · Mohs 2.5-3gray
Echinoidcommonfossil · Mohs 3-4white, gray, tan
Echinoid Geodeuncommonfossil · Mohs 7gray, white, clear- No imageEckeriteraremineral · Mohs 2.5-3white, gray
Edgariteraremineral · Mohs 3-3.5black, gray- No imageEdgrewiteraremineral · Mohs 6colorless, white, gray
Edingtoniteraremineral · Mohs 4-4.5white, gray, pink- No imageEdscottiteraremineral · Mohs 5white, gray
Ekebergitecommonmineral · Mohs 5-6white, gray, yellow- No imageElixiriteraremineral · Mohs 6-7white, gray, colorless
Elpiditeuncommonmineral · Mohs 5.5white, colorless, gray
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