Red Quartzite
Quartzite (SiO2)
metamorphic
Category
Organic (Non Rock)
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
River Stone (Quartzite Pebble)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Likely small metallic meteorite fragments
Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image
meteorite
Quartz with Epidote
Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
mineral
Rounded quartzite pebble
Quartzite, predominantly crystalline SiO₂
metamorphic
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Black Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Black Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite (or Massive Quartz)
Silicon Dioxide (SiO2)
metamorphic
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Chert (with Iron Staining)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Dyed Quartzite
Tumbled Metamorphosed Quartz (SiO2) with artificial pigment
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite inclusions
igneous
Petrified Wood
Silicified Wood / Xylopal
fossil