Pyrite
Iron Disulfide (FeS2)
mineral
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
Learn about Mineral (Tectosilicate) in the encyclopedia
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Shale
Shale (Argillaceous sedimentary rock)
sedimentary
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Moonstone (Feldspar)
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Quartz (Riverstone / Cobble)
Silicon Dioxide (SiO2)
mineral
Green Aventurine (Tumbled Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Amygdaloidal Rhyolite (often called Lake Superior Agate relative)
Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)
igneous
Peach Aventurine
Quartz variety (SiO2 + Hematite/Goethite inclusions)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Granite (Weathered River Rock)
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Granite
Granite (High-silica plutonic rock)
Igneous
Diamond
Diamond (C)
mineral
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite
Plutonic felsic igneous rock
igneous
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Basalt with Amygdaloidal Infilling
Porphyritic or Amygdaloidal Basalt
igneous
Pyrite
Iron Pyrite (FeS2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Phantom Quartz with Chlorite and Hematite inclusions
Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)
mineral
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Schist
Mica Schist
metamorphic
Granite (Light-colored quartz/feldspar variety)
Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous