Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Category
Organic (Non Rock)
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Jasper-Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Corundum (Sapphire / Raw Sapphire)
Aluminum Oxide (Al2O3)
gemstone
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Menilite Opal (Goddess Stone)
Menilite Opalescent Silex (Amorphous Hydrated Silica)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Zebra Jasper
Opaque microcrystalline Quartz (SiO2) with impurities
sedimentary
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Quartzite (Silicon Dioxide, SiO2 + Fuchsite)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartzite with Chlorite staining
Metamorphic Quartzite (SiO2 with Chlorite inclusions)
metamorphic
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite (with Iron Staining)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Rough Chalcedony / Jasper Agate Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Septarian Nodules-like)
Silicon dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Chert (Fossiliferous Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Quartzite
Quartzite (mostly SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Opalite
Man-made Opalized Glass (Synthetic Glass)
gemstone
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil