Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
Igneous
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
Native Silver
Silver (Ag)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Quartz Pebble (Water-worn)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Iron-stained Milky Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz (Iron-stained or Ferruginous Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Quartzite Pebble (Yellow/Cloudy Quartz)
Silicon Dioxide (SiO2) - Recrystallized Sandstone
metamorphic
Quartzite with Iron Staining
Silicon Dioxide (SiO2) with Fe2O3 impurities
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Golden Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite (or Milky Quartz pebble)
Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (with potential fossil inclusions)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Milk Quartz (Tumbled Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
White Quartz (Milky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral