Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
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Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Chalcopyrite
CuFeS2
mineral
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (with probable iron staining)
Silicon dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gold bearing Quartz with Sulfides
Auriferous Quartz with Pyrite/Arsenopyrite (Au + SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz Mushroom)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Pegmatite
Igneous Pegmatite
igneous
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Serpentinite
Serpentinite
metamorphic
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Hematite Ball
Iron(III) oxide (Fe2O3)
mineral
Mixed gemstone bead bracelet
Likely rose quartz, amethyst, and possibly rhodonite or lepidolite beads
gemstone
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Sandstone
Arenite
sedimentary
Mica Schist
Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)
metamorphic
Chrysocolla with Malachite
Cu2-xAlx(H2-xSi2O5)(OH)4%CnH2O (Chrysocolla)
mineral
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Rounded gravel / river pebbles
Polymictic alluvial gravel, commonly quartz-, feldspar-, and lithic-rich clasts
sedimentary