Black Obsidian
Obsidian / Amorphous volcanic glass (SiO2)
igneous
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Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Quartzite River Rock
Metamorphic Rock (Quartzite)
metamorphic
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Pebble)
Microcrystalline to Cryptocrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite River Pebble
Quartzite (mostly SiO2)
metamorphic
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Quartzite Cobble
Metamorphosed Sandstone (SiO2)
metamorphic
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Chert (River Cobble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Quartzite (Ferruginous)
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Obsidian
Obsidian (Amorphous volcanic glass, predominantly SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
River Stone (Quartzite)
Metamorphosed Sandstone (SiO2)
metamorphic
Obsidian
Obsidian (principally SiO2, 70% or more silica)
igneous
Siltstone Pebble
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Unakite
Epidotized Granite
metamorphic