Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Aventurine
Silicon dioxide (Quartz) with inclusions (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Aventurine
Aventurine Quartz (SiO2 + Fuschite inclusions)
metamorphic
Quartzite pebble
Quartzite (SiO2 based)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite (Quartz sand or Chert)
Quartzite (SiO2)
metamorphic
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Pumice
Pumice
igneous
Pumice
Vesicular Felsic Extrusive Igneous Rock
igneous
Red Tuff / Sandstone
Rhyolitic Tuff / Pyroclastic Volcanic Rock
igneous
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (Volcanic glass containing Cristobalite)
igneous
Pumice
Pumice (a highly vesicular extrusive volcanic glass)
igneous
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Desert Rose Fragment (Atypical) / Weathered Chert
Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumice (Volcanic Rock / Glass Froth)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (SiO2)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Obsidian
Volcanic Glass (High silica amorphous rock)
igneous
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Quartzite
Quartzite (SiO2 main component)
metamorphic
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Tumbled brown chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral