Raw Corundum (Sapphire/Ruby variant)
Aluminum oxide (Al2O3)
mineral
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
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Gold Nugget
Native Gold (Au)
mineral
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) within a resin matrix
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Yellow Ochre / Limonite
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
mineral
Dyed Quartzite
Tumbled Metamorphosed Quartz (SiO2) with artificial pigment
metamorphic
Chondrite Meteorite
Ordinary Chondrite (S-type asteroid origin)
igneous
Hematite
Hematite (Fe2O3)
mineral
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartzite (or Massive Quartz)
Silicon Dioxide (SiO2)
metamorphic
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Pumice or Vesicular Basalt/Scoria (water-worn)
Vesicular volcanic rock
igneous
Anthracite Coal
Anthracite
metamorphic
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Melo Melo Pearl (or Golden Chalcedony / Yellow Jasper Sphere)
Non-nacreous calcium carbonate pearl (or SiO2 - Silicon Dioxide)
gemstone
Quartz with Epidote
Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
mineral
Quartzite
Quartzite (Metamorphic rock primarily composed of SiO2)
metamorphic
Dyed Quartzite (Pink/Magenta)
Silicon Dioxide (SiO2) - Artificially Colored Quartzite
mineral
Banded Rhyolite (Wonderstone)
Rhyolite (High-silica volcanic rock)
igneous
Quartzite
Silica (SiO2) quartzite
metamorphic
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2)
mineral
Shale or Mudstone (Based on appearance)
Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)
Sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Anthracite Coal
Anthracite (Metamorphic/High-grade Coal)
sedimentary
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Citrine
Silicon Dioxide (SiO2)
gemstone
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Yellow Banded Agate
Silicon Dioxide (SiO₂)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Chalcedony (SiO2) with iron inclusions
sedimentary
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Picture Jasper
Impure variety of silica (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Natural silica glass)
igneous