Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Chert (within Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Biotite)
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Pink Granite
Phaneritic intrusive igneous rock (high Potassium-Feldspar)
igneous
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2 inclusions)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Granite (Pink/Red Orthoclase variety)
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Mica Schist
Schist (muscovite-biotite schist)
metamorphic
Granite
Granite (Silicic Plutonic Rock)
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Vesicular Basalt with Zeolite
Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Bloodstone / Heliotrope
Cryptocrystalline Quartz (SiO2 with inclusions)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Basalt with Quartz Vein
Aphanitic Mafic Igneous Rock with Silicon Dioxide (SiO2) inclusion
igneous
Greenstone / Diorite
Intermediate plutonic igneous rock
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous