Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity isotopes)
igneous
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sandstone
Arenite
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Stream Pebble)
Arenite (primarily SiO2)
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (Water-worn)
Silicon Dioxide (SiO2)
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pumice
Vesicular volcanic glass (primarily Alumino-silicates)
igneous
Pumice
Pumicite
igneous
Obsidian
Volcanic glass (SiO2-rich extrusive igneous rock)
igneous
Orange Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid / impact glass