Chert (or Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineraloid (Man Made Glass)
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Smoky Quartz (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (volcanic glass)
igneous
Pumice
Pumice (volcanic glass)
igneous
Pale green translucent mineral fragment
Indeterminate; possibly fluorite, calcite, or glassy quartz
mineral
Smoky quartz (rough, water-worn crystal)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Pumice
Pumice (Volcanic Glass)
igneous
Tektite
Natural impact glass
meteorite
Fulgurite
Lechatelierite (Silica glass)
mineral
Black Obsidian
Volcanic Glass (SiO2)
igneous
Tektite
Tektite (meteoritic glass)
meteorite
Pumice
Pumice (Volcanic Glass)
igneous
Obsidian
Obsidian (volcanic glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Pumice
Pumice (volcanic glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Pumice
Pumice (volcanic glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous