Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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Pumice
Pumice (Vitreous volcanic rock)
igneous
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Green Agate
Silicon dioxide (SiO₂)
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Sandstone Concretion
Sedimentary concretion
Sedimentary
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Sandstone
Arenite (with iron oxide cement)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert
Chert (Microcrystalline Quartz)
sedimentary
Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Granite
Granite (a plutonic rock)
Igneous
Granodiorite
Intrusive Igneous Rock
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Sandstone
Arenite
sedimentary