Milky quartz (quartz-rich rock)
Quartz, silicon dioxide (SiO₂); likely massive quartz with minor iron-stained impurities
mineral
Category
Mineral (Synthetic Glass)
Browse mineral (synthetic glass) specimens identified by the Rock Identifier community.
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Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy) on Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
mineral
Citrine (Heat-treated Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Quarzite or Massive Quartz vein)
Silicon Dioxide (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Feldspar (Plagioclase / Potassium Feldspar)
Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 dominated sandstone)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Agate/Jasper pebble)
Silicon dioxide (SiO2)
mineral
Quartz with Epidote inclusions
Silicon Dioxide (SiO2) with Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Alluvial Pebbles)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Silver Sheen Obsidian
Volcanic Glass (Amorphous Silicon Dioxide - SiO2 with impurities)
igneous
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral