Rare rocks & minerals
Rare rocks and minerals occur in only a handful of localities worldwide, or in such small quantities that good specimens command serious money. These are the trophy pieces of cabinet collectors.
Showing 601–720 of 4900 rare entries (page 6 of 41).
Cadmoinditeraremineral · Mohs 3-4black, dark gray
Cadmoseliteraremineral · Mohs 3.5-4black, dark gray
Cadwaladeriteraremineral · Mohs 2yellow, brown, colorless- No imageCaesiumpharmacosideriteraremineral · Mohs 2.5yellow, yellowish-brown, greenish-yellow
Cafarsiteraremineral · Mohs 5-6dark brown, black, reddish-brown
Cafetiteraremineral · Mohs 3-4yellow, brown, colorless
Cahniteraremineral · Mohs 3white, colorless- No imageCairncrossiteraremineral · Mohs 3white, colorless
Calaveriteraremineral · Mohs 2.5-3brass-yellow, silver-white
Calciboriteraremineral · Mohs 6.5colorless, white, gray- No imageCalcinaksiteraremineral · Mohs 4-5colorless, white
- No imageCalcio-olivineraremineral · Mohs 6white, colorless, gray
Calcioancylite-(Ce)raremineral · Mohs 4-4.5yellow, brown, tan
Calcioancylite-(Nd)raremineral · Mohs 4-4.5yellow, brown, pink
Calcioandyrobertsiteraremineral · Mohs 3pale blue, white, colorless
Calcioaravaipaiteraremineral · Mohs 2.5colorless, white, yellowish- No imageCalcioburbankiteraremineral · Mohs 3.5white, pale yellow, colorless
- No imageCalciocatapleiiteraremineral · Mohs 5.5-6white, yellowish, brownish
- No imageCalciocopiapiteraremineral · Mohs 2.5-3yellow, pale yellow, sulfur yellow
- No imageCalciodelrioiteraremineral · Mohs 2yellow, yellow-orange
Calcioferriteraremineral · Mohs 2.5yellow, yellowish-brown, white
Calciohilairiteraremineral · Mohs 4yellow, brown, colorless- No imageCalciolangbeiniteraremineral · Mohs 3-3.5white, colorless, pale yellow
- No imageCalciomurmaniteraremineral · Mohs 3-4pink, brown, lavender
Calciopetersiteraremineral · Mohs 3green, bluish-green- No imageCalciosamarskiteraremineral · Mohs 5-6black, brownish-black
Calciotantiteraremineral · Mohs 4colorless, white, yellow
Calciouranoiteraremineral · Mohs 2-3yellow, orange-yellow- No imageCalcioursiliteraremineral · Mohs 2-3yellow, golden yellow
Calciumraremineral · Mohs 1.75silver-white, pale yellow
Calcjarliteraremineral · Mohs 4colorless, white, gray- No imageCalclaciteraremineral · Mohs 2white, colorless
Calcurmoliteraremineral · Mohs 2-3yellow, orange-yellow
Calderiteraremineral · Mohs 7-7.5reddish-brown, brown, orange-brown
Calderóniteraremineral · Mohs 2.5yellow, yellowish-orange
Caledoniteraremineral · Mohs 2.5-3deep blue, blue-green, green
Calkinsite-(Ce)raremineral · Mohs 2.5yellow, brown, white
Callaghaniteraremineral · Mohs 3blue, blue-green
Calomelraremineral · Mohs 1.5-2white, yellowish-white, gray
Calumetiteraremineral · Mohs 2deep blue, sky blue
Calvertiteraremineral · Mohs 2white, colorless
Calzirtiteraremineral · Mohs 6dark brown, reddish-brown, black- No imageCamanchacaiteraremineral · Mohs 5-6dark green, black, brownish-green
- No imageCámaraiteraremineral · Mohs 3.5yellow, brown
- No imageCamaronesiteraremineral · Mohs 3white, colorless, pale yellow
Camérolaiteraremineral · Mohs 2blue, pale blue
Cameroniteraremineral · Mohs 3.5-4brass-yellow, pale gold- No imageCamgasiteraremineral · Mohs 3-4white, colorless
- No imageCaminiteraremineral · Mohs 3-3.5white, colorless, pale yellow
Campigliaiteraremineral · Mohs 2light blue, blue-green- No imageCampostriniiteraremineral · Mohs 3yellow, brownish-yellow
Canaphiteraremineral · Mohs 2white, colorless
Canasiteraremineral · Mohs 5-6yellow, yellowish-green, brownish
Canavesiteraremineral · Mohs 2white, colorless
Cancrisiliteraremineral · Mohs 5-6colorless, white, gray- No imageCanfielditeraremineral · Mohs 2.5black, grayish-black
Cannizzariteraremineral · Mohs 2lead-gray
Cannoniteraremineral · Mohs 2-3colorless, white- No imageCanosioiteraremineral · Mohs 3.5yellow, yellowish-orange
Canutiteraremineral · Mohs 3colorless, white, yellowish- No imageCaoxiteraremineral · Mohs 2yellow, yellowish-brown
Capgaronniteraremineral · Mohs 2.5white, colorless, pale yellow
Cappelenite-(Y)raremineral · Mohs 6.5greenish-brown, brown, yellowish-brown
Capranicaiteraremineral · Mohs 3.5colorless, white
Caracoliteraremineral · Mohs 3white, colorless, pale yellow- No imageCarboboriteraremineral · Mohs 2white, colorless
- No imageCarbobystriteraremineral · Mohs 5-6colorless, white
Carbocernaiteraremineral · Mohs 3white, yellow, brownish-yellow
Carboiriteraremineral · Mohs 5-6black, dark brown- No imageCarbokentbrooksiteraremineral · Mohs 5-6dark brown, reddish-brown
Carbonatecyanotrichiteraremineral · Mohs 2-3blue, sky-blue
Carbonatiterareigneous · Mohs 3-4white, gray, tan- No imageCarditeraremineral · Mohs 3colorless, white, yellowish
- No imageCarducciiteraremineral · Mohs 2.5lead-gray, silver-white
Caresiteraremineral · Mohs 2.5white, colorless, pale yellow
Carletoniteraremineral · Mohs 4-4.5blue, colorless, white
Carletonmooreiteraremineral · Mohs 3white, silvery-white- No imageCarlfrancisiteraremineral · Mohs 3.5dark brown, brownish red, black
Carlfriesiteraremineral · Mohs 3.5yellow, pale yellow- No imageCarlgieseckeite-(Nd)raremineral · Mohs 4-5reddish-brown, brown
Carlhintzeiteraremineral · Mohs 3.5colorless, white- No imageCarliniteraremineral · Mohs 3pale yellow, yellow-white
Carlosbarbosaiteraremineral · Mohs 3-4yellow, yellowish-orange- No imageCarlosruiziteraremineral · Mohs 2-3yellow, yellowish-orange
Carlosturaniteraremineral · Mohs 2.5brown, greenish-brown, black
Carlsbergiteraremineral · Mohs 3.5silver-white, gray- No imageCarlsoniteraremineral · Mohs 2yellow, greenish-yellow
Carmeltaziteraremineral · Mohs 8.5-9black, blue, green- No imageCarmichaeliteraremineral · Mohs 6.5-7brown, reddish-brown, black
Carminiteraremineral · Mohs 3.5carmine-red, reddish-brown, orange-red
Carobbiiteraremineral · Mohs 2colorless, white
Carpathiteraremineral · Mohs 1.5pale yellow, yellow, golden yellow- No imageCarraraiteraremineral · Mohs 2.5white, colorless
Carrboyditeraremineral · Mohs 2green, pale green, bluish-green
Carrolliteraremineral · Mohs 4.5-5.5light steel-gray, white, iron-black- No imageCaryiniteraremineral · Mohs 3.5yellow, yellowish-brown, brown
- No imageCaryochroiteraremineral · Mohs 3-4brown, reddish-brown
Caryopiliteraremineral · Mohs 3-4brown, yellow-brown, red-brown
Cascanditeraremineral · Mohs 5-6pink, reddish-pink
Caseyiteraremineral · Mohs 2yellow, brownish-yellow- No imageCassagnaiteraremineral · Mohs 4red, orange-red, brownish-red
Cassedanneiteraremineral · Mohs 3orange, orange-red
Cassidyiteraremineral · Mohs 4green, yellowish-green
Castellaroiteraremineral · Mohs 2.5yellow, yellow-orange
Caswellsilveriteraremineral · Mohs 3.5black, gray
Cat's Eye Chrysoberylraregemstone · Mohs 8.5yellow, greenish-yellow, brownish-green- No imageCatalanoiteraremineral · Mohs 2white, colorless
- No imageCatamarcaiteraremineral · Mohs 3-3.5gray, black
Cattieriteraremineral · Mohs 5-6dark gray, grayish white- No imageCattiiteraremineral · Mohs 2colorless, white
Cavansiteraremineral · Mohs 3-4bright blue, azure blue, greenish blue- No imageCavoiteraremineral · Mohs 3white, colorless
- No imageCayalsite-(Y)raremineral · Mohs 6.5black, brownish-black, brown
Caysichite-(Y)raremineral · Mohs 4.5white, yellowish-white, colorless
Cebaite-(Ce)raremineral · Mohs 4.5yellow, brown, colorless
Cebolliteraremineral · Mohs 5white, colorless, grayish
Čechiteraremineral · Mohs 4.5-5black, brownish black
Čejkaiteraremineral · Mohs 2colorless, white, pale yellow
Celsianraremineral · Mohs 6white, colorless, yellow
Centennialiteraremineral · Mohs 2colorless, white
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