Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
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Granite
Phaneritic Igneous Rock (Granite)
igneous
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Basalt with Olivine and Scoria
Extrusive Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Zebra Stone (Silicified Siltstone)
Silicified Siltstone with Quartz/Kaolinite inclusions
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Basalt with Weathering Crust
Extrusive mafic volcanic rock
igneous
Dyed Quartz Crystal
Silicon Dioxide (SiO2) with artificial pigment
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Basalt River Cobble
Basalt (Aphanitic extrusive mafic igneous rock)
igneous
Schist
Mica Schist (primarily composed of quartz, feldspar, and mica)
metamorphic
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Alkali-feldspar, Quartz, and Plagioclase composition)
igneous
Green Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Ruby and Sapphire Cluster Ring
Corundum (Al2O3)
gemstone
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Graphite
Graphite (C)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite-rich sequence)
metamorphic
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Quartz and Mixed Gravel
Silicon Dioxide (SiO2) with minor impurities
Mineral
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
sedimentary
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Basalt (Greenstone)
Basalt with chlorite/epidote (often referred to as Greenstone)
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Imperial Topaz
Aluminum Silicate Fluoride Hydroxide Al2SiO4(F,OH)2
mineral