Sandstone (with Iron Oxidation)
Arenite (SiO2 with Fe-oxides)
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Green Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Mixed Crushed Stone
Aggregate (varied mineral composition)
igneous and sedimentary mixture
Diamond
Carbon (C)
gemstone
Quartzite Pebble (or River Agate/Chert)
Silicon Dioxide (SiO2)
metamorphic
River Pebble (Quartz-rich)
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Rough Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (Uncut Crystal)
Carbon (C)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Shale
Shale (clay-rich mudstone)
sedimentary
Green Tiger's Eye
Quartz (SiO2) with fibrous crocidolite inclusions (dyed)
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Shale
Laminated Mudstone
sedimentary
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amber
Succinite (Fossilized Tree Resin) - C10H16O
mineral
Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Diamond (or Cut Gemstone / Cubic Zirconia)
Carbon (C)
gemstone
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Granite
Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Obsidian (volcanic glass with Hematite/Magnetite inclusions)
igneous
Green Sandstone Pebble (River/Beach Pebble)
Glauconitic Sandstone
sedimentary
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Diamond (Uncut/Rough)
Carbon (C)
mineral
Pearl
Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)
mineral
Diamond (or Diamond Simulant/Cubic Zirconia)
Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Diamond (or high-quality simulant like Cubic Zirconia)
Carbon (C) - Native Element
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Quartz (specifically Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
C (Carbon) or ZrO2 (Zirconium Dioxide)
mineral
Diamond (appearing in jewelry)
Diamond (pure Carbon, C)
mineral
Pearl
Biogenic CaCO3 (Aragonite)
mineral
Diamond
Carbon (C)
gemstone