Vesicular basalt (possibly slag-contaminated)
Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals
igneous
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
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Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Polished fossilized wood (likely petrified wood)
Silicified wood; primarily quartz (SiO₂) replacing wood tissue
fossil
Copper
Native Copper (Cu)
mineral
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Paving-concrete aggregate with a rounded stone
Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock
sedimentary
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Mohave Turquoise (Composite/Stabilized)
Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions
mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Likely polished quartz or glass-like mineral cabochon
Probably quartz (SiO₂), though the image cannot exclude man-made glass
mineral
Blue Impression Jasper beads
Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions
gemstone
Granite
Granite (a phaneritic intrusive igneous rock)
igneous
Toast
Triticum aestivum (processed)
not a geological specimen
White cabochon gemstone, likely milky chalcedony or opalite
Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass
gemstone
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Mixed quartz gemstone bead bracelet
Quartz, silicon dioxide (SiO₂), in varieties including smoky quartz, amethyst, rutilated quartz, and possibly tourmalinated quartz
gemstone
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Clear quartz crystal pendant
Quartz (silicon dioxide, SiO₂)
mineral
Amber cabochon pendant
Amber (fossilized plant resin), chiefly polymerized diterpenoid resin
gemstone
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
mineral
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Hand-Drawn Gengar Pokémon Card Artist Item
Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)
Organic (Paper and Cellulose)
Blue Goldstone
Aventurine Glass
Man-made glass (often grouped with minerals in lapidary)
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Granite
Granite (plutonic igneous rock)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Man-made Ceramic / Clay Figurine
Aluminosilicate Ceramic (Processed Clay)
Synthetic (not a rock or mineral)
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid