Orthoclase (Potassium) Feldspar in Quartz
KAlSi3O8 (Potassium Aluminum Silicate)
igneous
Category
Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)
Browse mineral like byproduct (often mistaken for igneous rock or meteorite) specimens identified by the Rock Identifier community.
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Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Dumortierite Quartz
Dumortierite in Quartz (Al6O3(BO3)(SiO4)3)
mineral
Gabbro
Basaltic Plutonic Rock (Gabbro)
igneous
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Granite (Gneissic / Weathered Pebble)
Felsic intrusive igneous rock (Granite)
igneous
Amygdaloidal Basalt with Epidote
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Rhyolitic Matrix
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Granite
Granite
Igneous
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)
igneous
Lepidodendron Fossil (Scale Tree)
Lepidodendron sp.
fossil
Granodiorite
Granodiorite
igneous
Gneiss
Gneiss
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (major components: SiO2 and Al2O3)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Green Quartzite (Aventurine type)
Quartzite (principally Quartz, SiO2) with inclusions of Fuchsite
metamorphic
Gneiss
Gneiss
metamorphic
Feldspar-Quartz Rock (likely Pegmatite or Granite)
Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)
igneous
Granite
Granite
igneous
Porphyritic Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Spinel
Magnesium aluminum oxide (MgAl2O4)
gemstone
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral