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 3241-3300 of 5,084 specimens
Browse by Letter
Okieite
Okruschite
Oldhamite
Hardness: 4
Olekminskite
Hardness: 3
Olenite
Hardness: 7
Olgite
Hardness: 4.5
Olivine
Olkhonskite
Hardness: 8
Olmiite
Hardness: 5 - 5.5
Olmsteadite
Hardness: 4
Olsacherite
Hardness: 3 - 3.5
Olshanskyite
Hardness: 3.5 - 4
Olympite
Hardness: 4
Omariniite
Omeiite
Hardness: 7
Ominelite
Hardness: 7
Omongwaite
Omphacite
Hardness: 5 - 6
Omsite
Hardness: 3
Ondrušite
Hardness: 2 - 3
Oneillite
Hardness: 5 - 6
Onoratoite
Oosterboschite
Hardness: 5
GemOpal
Hardness: 5.5 - 6.5
Ophirite
Hardness: 2
Oppenheimerite
Orcelite
Ordonezite
Hardness: 6.5
Oregonite
Hardness: 5
Oreillyite
Organovaite-mn
Hardness: 5
Organovaite-zn
Hardness: 5
Orickite
Hardness: 3.5
Orientite
Hardness: 4 - 5
Orileyite
Orlandiite
Orlite
Orlovite
Hardness: 2 - 3
Orlymanite
Hardness: 4 - 5
Orpiment
Hardness: 1.5 - 2
Orschallite
Hardness: 4
Orthobrannerite
Hardness: 5.5
Orthocuproplatinum
Hardness: 4
Orthojoaquinite-(ce)
Hardness: 5 - 5.5
Orthojoaquinite-(la)
Hardness: 5
Orthominasragrite
Hardness: 1
Orthopinakiolite
Hardness: 6
Orthoserpierite
Orthowalpurgite
Hardness: 4.5
Osakaite
Osarizawaite
Hardness: 3 - 4
Osarsite
Hardness: 6
Osbornite
Hardness: 8.5
Oscarkempffite
Hardness: 3 - 3.5
Osmium
Hardness: 6 - 7
Osumilite
Hardness: 5 - 6
Osumilite-(mg)
Hardness: 5 - 6
Oswaldpeetersite
Hardness: 2 - 3
Otavite
Hardness: 3.5 - 4
Otjisumeite
Hardness: 3
Browse Other Categories
Identify Minerals Instantly
Snap a photo to instantly identify any minerals specimen. Get detailed properties, hardness, and chemical composition.