Tektite (Indochinite)
Tektite (High-silica natural glass)
mineralogical glass/meteorite impactite
Category
Mineralogical Glass
Browse mineralogical glass specimens identified by the Rock Identifier community.
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Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Pyrite Sun (Pyrite Dollar)
Iron Disulfide (FeS2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Green River Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Dendritic Quartz
Silicon Dioxide (SiO2) with Manganese Oxide inclusions
mineral
Red Granite
Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Red Granite
Phaneritic Plutonic Rock (High Potassium Feldspar)
igneous
Iron Slag
Iron smelting byproduct (Glassy/vesicular silicate)
anthropogenic / industrial byproduct
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Pink Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granite (with Orthoclase and Quartz)
Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)
igneous
Tiger's Eye (with Hematite/Jasper)
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)
mineralogical
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Phaneritic Plutonic Igneous Rock (Granite)
igneous
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
River Pebbles (Stream-rounded rocks)
Fluvial Detritus (varied mineralogy)
Mixed (predominantly sedimentary and igneous)
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Granite
Granite (phaneitic intrusive igneous rock)
igneous