Quartz
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Sea Glass or River-worn Pebble style)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurity)
Igneous
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 enriched)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Rough Quartz (likely Rose or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartz (Milky/Gray variety)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Point
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Quartz (with iron oxide staining)
Silicon Dioxide (SiO2)
mineral
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Cloudy Quartz
Silicon Dioxide (SiO2)
mineral