Minerals
Minerals are naturally occurring inorganic substances with a specific chemical composition and crystalline structure. They are the building blocks of rocks and are classified by their chemical composition and crystal system.
Showing 3841-3900 of 5,084 specimens
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Rheniite
Rhodarsenide
Hardness: 4 - 5
Rhodesite
Hardness: 3 - 4
Rhodium
Hardness: 3.5
Rhodizite
Hardness: 8
Rhodostannite
Hardness: 4
Rhodplumsite
Rhomboclase
Hardness: 2
Rhönite
Hardness: 5 - 6
Ribbeite
Hardness: 5
Richardsite
Hardness: 3
Richardsollyite
Richellite
Hardness: 2 - 3
Richelsdorfite
Hardness: 2
Richetite
Hardness: 3.5
Richterite
Hardness: 5 - 6
Rickardite
Hardness: 3.5
Rickturnerite
Riebeckite
Hardness: 5 - 5.5
Riesite
Rietveldite
Hardness: 2
Rilandite
Hardness: 2 - 3
Rimkorolgite
Hardness: 3
Ringwoodite
Rinkite-(ce)
Hardness: 5
Rinkite-(y)
Hardness: 5
Rinmanite
Hardness: 6 - 7
Rinneite
Hardness: 3
Riomarinaite
Hardness: 2 - 3
Ríosecoite
Hardness: 3.5
Riotintoite
Hardness: 2.5
Rippite
Rittmannite
Hardness: 3.5
Rivadavite
Hardness: 3.5
Riversideite
Hardness: 3
Roaldite
Hardness: 5.5 - 6.5
Robertsite
Hardness: 3.5
Robinsonite
Hardness: 2.5 - 3
Rodalquilarite
Hardness: 2 - 3
Rodolicoite
Roeblingite
Hardness: 3
Roedderite
Hardness: 5 - 6
Rogermitchellite
Roggianite
Rohaite
Hardness: 3 - 3.5
Rokühnite
Rollandite
Hardness: 4 - 4.5
Romanèchite
Hardness: 5 - 6
Romanorlovite
Hardness: 3
Romarchite
Romeite
Römerite
Hardness: 3 - 3.5
Rondorfite
Rongibbsite
Hardness: 5
Ronneburgite
Hardness: 3
Röntgenite-(ce)
Hardness: 4.5
Rooseveltite
Hardness: 4 - 4.5
Roquesite
Hardness: 3.5 - 4
Rorisite
Hardness: 2
Roscherite
Hardness: 4.5
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