Black Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Non Geological
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Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Flesh-toned Siltstone
Siltstone (composed of microscopic Quartz and Feldspar grains)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Amber
Succinite (approximate formula C10H16O)
mineraloid
Red Quartzite
Metamorphic Quartzite (predominantly SiO2 with iron oxide impurities)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide) with impurities
igneous
Tektite (Indochinite)
Tektite (High-silica natural glass)
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Quartzite Pebbles
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Amber
Succinite (fossilized resin)
Organic Mineraloid
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Obsidian Arrowhead
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Weathered iron-rich sandstone or ironstone cobble
Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
Green Sheen Obsidian
Volcanic Glass (SiO2 with microscopic inclusions)
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Polished copper-bearing mineral specimen, likely malachite-rich copper ore
Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Amber
Fossilized tree resin
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Amber
Fossilized Tree Resin
gemstone