Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Prase Quartz on Feldspar
Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)
mineral
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite Pebble (Weathered)
Phaneritic Felsic Igneous Rock
igneous
Fossilized Shark Tooth
Otodus sp. (approximate genus) / Hydroxyapatite fossil
sedimentary
Sapphirine in Magnesian Schist
Sapphirine: (Mg,Al)8(Al,Si)6O20
metamorphic
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock
Mica Schist with Quartz
Muscovite/Biotite Schist
metamorphic
Granitic Pegmatite
Pegmatite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz composition)
metamorphic
Rhodonite with Manganese Oxides
Rhodonite (Mn,Fe,Mg,Ca)SiO3
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Schist
Schist
metamorphic
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Rhodochrosite in Quartz
Manganese Carbonate (MnCO3)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone Pebble
Arenite (SiO2 principal)
sedimentary
Yellow Aventurine
Quartz (Silicon Dioxide) with Mica inclusions (SiO2)
mineral
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Malachite
Cu2CO3(OH)2 (Copper Hydroxide Carbonate)
mineral
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
White Calcite
Calcium Carbonate (CaCO3)
mineral