Granite
Granitic intrusive igneous rock
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Biotite / Black Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Diorite
Diorite
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Diorite
Diorite (Intermediate Plutonic Rock)
igneous
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Wishing Stone (Graywacke with Quartz Vein)
Graywacke Sandstone containing a Quartz (SiO2) intrusion
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic plutonic rock (SiO2 + Al2O3 + K2O + Na2O + CaO)
igneous
Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Granitic Pegmatite with Muscovite Mica
Pegmatite (containing KAl2(AlSi3O10)(OH)2)
igneous
Serpentinite (with Pyrite/Garnet inclusions)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Graywacke
Graywacke Sandstone
sedimentary
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions
igneous
Limestone (with Calcite Veining)
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Schist
Mica Schist
metamorphic
Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Andesite
Intermediate Volcanic Rock (Andesite)
igneous
Mica Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (contains Muscovite/Biotite, Quartz)
metamorphic
Jasper River Stone
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
sedimentary
Dendritic Siltstone
Siltstone with Manganese Dendrites (MnO2)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Schist
Mica Schist
metamorphic
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Tree Agate
Dendritic Agate (Silicon Dioxide - SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Labradorite
Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8
mineral