Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Quartzite Pebble
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Black Obsidian
Obsidian (Volcanic Glass, SiO2+)
igneous
Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Obsidian Fetish Carving with Turquoise Inlay
Volcanic Glass with Turquoise (CuAl6(PO4)4(OH)8·4H2O)
igneous
Raw Sapphire / Corundum
Corundum (Al2O3 - Aluminium oxide)
mineral
Unknown white fragment
Unknown
unknown
Quartzite
Quartzite (SiO2 dominant)
metamorphic
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Man-made)
mineraloid
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Red Quartzite
Metamorphic Quartzite (predominantly SiO2 with iron oxide impurities)
metamorphic
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite (River Stone)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Cobble
Quartzite (SiO2 based)
metamorphic
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Obsidian
Volcanic Glass (Rich in SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass, ~70–75% SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Quartzite
Quartzite (mostly SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian Jewelry Piece
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite
metamorphic
Jasper
Silicon Dioxide (Microcrystalline Quartz / Chalcedony)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Siltstone
Siltstone
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic