Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Synthetic (Glass)
Browse synthetic (glass) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (principally SiO2)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2)
igneous
Tektite (Indochinite)
Tektite (High-silica impact glass)
mineraloid
Obsidian
Obsidian (Volcanic Glass, SiO2 dominated)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, ~70–75% SiO2)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Celadonite in Amygdaloidal Basalt
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Chemical composition: 70–75% SiO2 + MgO, Fe3O4)
igneous
Tektite (Indochinite)
Tektite (Natural Glass, SiO2 + Al2O3)
mineral
Apache Tears (Obsidian)
Hydrated Volcanic Glass (Amorphous SiO2 + H2O)
igneous
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2 prominent)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Pumice
Pumice (a highly vesicular extrusive igneous rock)
Igneous
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Slag
Anthropogenic glassy silicate
Mineral-like byproduct