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 805 gray rocks (page 2 of 7).
Burbankiteraremineral · Mohs 3.5yellow, pink, white
Burkeiteraremineral · Mohs 3.5white, gray, pale yellow
Bustamiteuncommonmineral · Mohs 5.5-6.5pink, reddish-pink, brownish-pink
Bytowniteuncommonmineral · Mohs 6-6.5white, gray, yellowish
Cactus Quartzuncommonmineral · Mohs 7purple, white, yellow
Calciboriteraremineral · Mohs 3.5colorless, white, gray
Calcified Coralcommonfossil · Mohs 3-4white, brown, tan- No imageCalcio-olivineraremineral · Mohs 6white, colorless, gray
Calcioancylite-(Ce)raremineral · Mohs 4-4.5pink, white, gray
Calcite Nodulecommonmineral · Mohs 3white, yellow, gray
Calcjarliteraremineral · Mohs 4colorless, white, gray
Calomelraremineral · Mohs 1.5-2white, yellowish-white, gray
Calymenecommonfossilgray, brown, tan
Cameroniteraremineral · Mohs 3.5-4gray
Cancriniteuncommonmineral · Mohs 5-6yellow, orange, white
Carbonatiterareigneous · Mohs 3-4white, gray, tan
Carlsbergiteraremineral · Mohs 7silver-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
Cave Pearlscommonmineral · Mohs 3white, cream, gray
Celestinecommonmineral · 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
Chalcedony Geodecommonmineral · Mohs 6.5-7white, gray, blue
Chalcedony Nodulecommonmineral · Mohs 6.5-7white, gray, blue
Chalkcommonsedimentary · Mohs 1white, off-white, gray
Charlevoix Stonecommonfossil · Mohs 3-4gray, white, beige
Charnockitecommonigneous · Mohs 6-7gray, greenish, brown- No imageChenmingiteraremineral · Mohs 6black, gray
Chertcommonmineral · Mohs 6.5-7white, gray, brown
Chert Nodulecommonmineral · 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
Clam 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
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
Cold Water Agatecommonmineral · Mohs 6.5-7gray, white, yellow
Colemaniteuncommonmineral · Mohs 4.5colorless, white, gray
Collophanecommonmineral · 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
Concretion With Fossilcommonfossil · 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
Crandalliteuncommonmineral · Mohs 5white, colorless, yellow
Crazy Lace Agatecommonmineral · Mohs 6.5-7white, gray, yellow
Criddleiteraremineral · Mohs 3-3.5gray
Crinoidcommonfossil · Mohs 3-4gray, white, tan
Crinoid Stemcommonfossil · Mohs 3-4gray, white, tan
Crinoidal Limestonecommonsedimentary · Mohs 3gray, tan, white
Cristobaliteuncommonmineral · Mohs 6.5white, colorless, gray
Crocodile Toothcommonfossil · Mohs 3-5brown, tan, black
Cryptomelanecommonmineral · Mohs 6-6.5black, gray
Cummingtoniteuncommonmineral · Mohs 5-6brown, gray, greenish-gray
Dalnegorskiteraremineral · Mohs 6white, colorless, gray
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 Bonecommonfossil · 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
Dogtooth Calcitecommonmineral · Mohs 3white, colorless, yellow- No imageDolomitecommonmineral · Mohs 3.5-4white, gray, pink
Dolostonecommonsedimentary · Mohs 3.5-4gray, white, buff
Drusy Quartzcommonmineral · Mohs 7colorless, white, gray
Dunham Dolomitecommonsedimentary · Mohs 3.5-4gray, buff, tan
Echinoidcommonfossil · Mohs 3-4white, gray, tan
Echinoid Geodeuncommonfossil · Mohs 7gray, white, clear
Eckermanniteraremineral · Mohs 5-6colorless, 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
Elrathiacommonfossilbrown, gray, black
Empressiteraremineral · Mohs 3.5white, pale brass yellow, gray- No imageEndelliteuncommonmineral · Mohs 2-2.5white, yellowish, gray
Enstatitecommonmineral · Mohs 5-6green, brown, gray
Epididymiteraremineral · Mohs 5.5white, colorless, gray
Epistoliteraremineral · Mohs 3.5white, gray, pink
Ertixiiteraremineral · Mohs 5.5-6colorless, white, gray
Eucryptiteraremineral · Mohs 6.5white, colorless, gray
Eudidymiteraremineral · Mohs 5.5-6white, colorless, gray
Eulytineraremineral · Mohs 4.5yellow, brown, gray
Eurypteriduncommonfossilbrown, black, tan
Eye Agatecommonmineral · Mohs 6.5-7white, gray, brown
Fairchilditeraremineral · Mohs 3colorless, white, gray- No imageFairfield Agatecommonmineral · Mohs 6.5-7brown, tan, white
Favositescommonfossil · Mohs 3-4gray, tan, brown
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