Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
Pumice
Pumice (Vesicular volcanic glass)
igneous
Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
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
Rose Quartz
Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals
mineral
White Topaz
Al2SiO4(F,OH)2
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
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
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Quartzite with Quartz Veining
Quartzite (primarily SiO2)
metamorphic
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Green Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Mica-rich Schist fragment
Mica Schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (70–75% SiO2)
Igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
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
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic