Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Not A Rock (Man Made Industrial Metal)
Browse not a rock (man made industrial metal) specimens identified by the Rock Identifier community.
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Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Diamond-set letter “L” jewelry piece
Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image
gemstone
Silicon Carbide (Carborundum)
Silicon Carbide (SiC) / Moissanite (natural)
mineral
Tumbled opalite (likely man-made glass)
Opalite, a trade name for opalescent glass; not natural opal
mineral
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Polished brown jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
gemstone
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
gemstone
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Diamond / Clear Quartz / Glass paste
Carbon (Diamond) / Silicon Dioxide (Quartz)
gemstone
Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Opalite
Man-made opalescent glass
gemstone
Goldstone
Aventurine Glass (Man-made)
mineral
Sea Glass
Man-made silicate glass
gemstone
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Sea Glass
Man-made vitreous material
mineral
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Tumbled clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Polished silver sheen obsidian heart
Obsidian (volcanic glass), primarily rhyolitic silica-rich glass
igneous
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Asphalt Concrete (Bituminous Pavement)
Aggregates in Bitumen Matrix
Technogenic / Anthropogenic Pavement Material
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
sedimentary (base), then artificial
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Opalite
Synthetic Glass (Simulated Moonstone/Opal)
gemstone
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Black glassy fragment, likely obsidian or industrial glass
Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary