Amber
Succinite (Fossilized Tree Resin)
gemstone
Category
Non Geological
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Jasper Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide Impurities
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Apache Tear
Obsidian (Natural volcanic glass)
igneous
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2 dominant)
metamorphic
Hag Stone
Perforated Calcarenite or Chert
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Unakite
Epidotized Granite
metamorphic
Yellow Quartzite River Stone
Quartzite (primarily SiO2)
metamorphic
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Bituminous Coal
Humic coal (Carboniferous fossil fuel)
sedimentary
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Quartzite Cobble
Quartzite (SiO2 based)
metamorphic
Red Quartzite (River Stone)
Quartzite (primarily SiO2)
metamorphic
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Basalt River Pebble
Mafic Igneous Rock (Fine-grained Basalt)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Mahogany Obsidian
Obsidian (volcanic glass with Hematite/Magnetite inclusions)
igneous
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Red Quartzite
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Mahogany Obsidian or Red Jasper
Silicon Dioxide with Iron Oxide (SiO2+Fe2O3)
Mineral/Igneous (Volcanic Glass)
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Quartzite Pebble
Quartzite
metamorphic
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Tektite
Natural impact glass
meteorite
Tektite
Natural impact glass
meteorite
Quartzite Cobble
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Quartzite
Quartzite
metamorphic
Chert (often associated with Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary