Pumice
Pumice (Amorphous volcanic glass)
igneous
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Pumice
Pumiceous rhyolite / Volcanic glass
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Quartzite
Silica (SiO2)
metamorphic
Tumbled Aventurine
Silicon Dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Rock (composed mainly of SiO2)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite
mineral
Quartzite with Quartz Veins
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Metamorphic Quartzite (predominantly SiO2 with iron oxide impurities)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Green Quartzite
Quartzite (primarily SiO2 with trace impurities)
metamorphic
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Pumice
Pumicite (Amorphous Volcanic Glass)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2)
igneous
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartz (River Stone)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Sandstone (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary