Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Category
Synthetic Glass
Browse synthetic glass specimens identified by the Rock Identifier community.
Rose Quartz
Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals
mineral
White Topaz
Al2SiO4(F,OH)2
mineral
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
mineral
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Libyan Desert Glass
Impactite (vitreous silica), SiO2
mineral
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Quartz (Yellow/Citrine variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Chert (Nodule)
Cryptocrystalline Silica (SiO2)
sedimentary
Rose Quartz
Quartz (Silicon Dioxide, SiO2) with trace inclusions of dumortierite
mineral
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary