Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Non Geological
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite (with Quartz Veining)
Quartzite (SiO2)
metamorphic
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Limestone (Riprap)
Calcium Carbonate (CaCO3)
sedimentary
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Anthracite Coal
Anthracite
sedimentary
Anthracite Coal
Anthracite
metamorphic
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Amber
Succinite (C10H16O)
mineral
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Amber
Succinates (Fossilized Tree Resin)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Ocean Jasper (Orbicular Jasper)
Orbicular Rhyolite (SiO2)
igneous
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Red Jasper
Silicon Dioxide (SiO2) with impure Iron oxides
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Amorphous SiO2 + Cristobalite)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite cobblestone
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous