Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
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Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Quartz (likely milky quartz or quartz glass-like fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Clear quartz sphere
Quartz (silicon dioxide, SiO₂)
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Polished opalite (likely man-made opalescent glass)
Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass
mineral
Zinc Alloy (Silver-plated)
Zinc Alloy Casting (Zn-Al-Mg-Cu)
mineral (refined metal)
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Diamond
Native Carbon (C)
mineral
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Goldstone (likely red/brown aventurine glass)
Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)
mineral
Blue goldstone
Man-made aventurine glass containing metallic copper particles; not a natural mineral
mineral
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Opalite (Man-made Glass)
Fused glass (typically made of dolomite and metal opacifiers)
Man-made Material / Glass
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Tumbled opalite (likely man-made glass)
Opalite, a trade name for opalescent glass; not natural opal
mineral
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz (likely quartz crystal fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Hematite Beads
Hematite (Fe2O3)
Mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Diamond
Cubic carbon (C)
mineral
Opalite (likely man-made opalescent glass)
Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)
mineral
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Obsidian (likely black volcanic glass)
Obsidian; primarily amorphous volcanic silica glass, approximately SiO₂-rich rhyolitic composition
igneous
Milky quartz (rough fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Opalite (likely man-made glass)
Opalite; amorphous silica glass, not a natural mineral
gemstone
Botryoidal chalcedony (likely agate/jasper variety)
Microcrystalline quartz, SiO₂
mineral
Polished black pebble, possibly obsidian
Volcanic glass (obsidian), likely; identification is tentative from the image
igneous
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous