Amber
Succinate (Fossilized Tree Resin)
mineraloid
Category
Mineraloid (Man Made)
Browse mineraloid (man made) specimens identified by the Rock Identifier community.
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Mahogany Obsidian
Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Chert
Chert (Microcrystalline Quartz)
sedimentary
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Sandstone
Arenite (mostly SiO2)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Diamond
Carbon (C)
gemstone
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Diamond (in Jewelry)
Carbon (C)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Obsidian
Volcanic glass (silica-rich rhyolitic melt; primarily SiO₂)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond
Native Carbon (C)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Diamond
Diamond (pure carbon C)
mineral
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Snowflake Obsidian
Volcanic Glass (spherulitic Obsidian) - SiO2 (with Cristobalite inclusions)
igneous
Sandstone
Arenite
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic