Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Basalt with Vesicles
Vesicular Basalt
Igneous
Mica Schist (Greenschist / Chlorite Schist)
Schist (rich in Muscovite, Chlorite, and Quartz)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous
Lepidolite
K(Li,Al)_3(Si,Al)_4O_10(F,OH)_2 (Lithium-bearing Mica)
mineral
Diorite
Diorite
igneous
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Rose Quartz and Lepidolite in Pegmatite
Crystalline Silicon Dioxide (SiO2) with Lithium-rich Mica (K(Li,Al)3(Al,Si)4O10(F,OH)2)
igneous
Granite (including Pegmatite variants)
Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)
Igneous
Precious Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Heat-Treated Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Biotite Schist
Biotite-rich Schist
metamorphic
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Mica
Muscovite / Biotite (Phyllosilicate group)
mineral
Quartz with Mica (Gneissic or Pegmatitic origin)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Likely basalt or other dark igneous rock
Basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)
Orbicular Quartz Diorite / Tonalite
igneous
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
igneous
Dendritic Agate
Chalcedony (Silicon Dioxide, SiO2) with Manganese/Iron oxide inclusions
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Phaneritic Acid Igneous Rock)
igneous
Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Basalt (Vesicular/Amygdaloidal)
Basalt
igneous
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary