Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
mineral
Category
Mineral Based Human Made Alloy
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Green Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Basalt
Basalt (Mafic Extrusive)
igneous
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
Sandstone (Quartzite-rich River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (variant Flint/Jasper)
Microcrystalline Opaline Silica (SiO2)
sedimentary
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper/Common Opal transition)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
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
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Quartz and Mixed Gravel
Silicon Dioxide (SiO2) with minor impurities
Mineral
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
sedimentary
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Granite pebble
Granite, chiefly quartz, feldspar, and mica
igneous
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
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
Basalt (Greenstone)
Basalt with chlorite/epidote (often referred to as Greenstone)
igneous
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Heliotrope (Bloodstone)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Quartz Vein in Siltstone
Siltstone with Quartz (SiO2) inclusion
sedimentary