Jade (likely Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Category
Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)
Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.
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Chalcanthite
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Asphalt fragment
Bituminous concrete
anthropogenic material
Granodiorite
Granodiorite
Igneous
Polished black stone sphere (likely black basalt or black tourmaline)
Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone
igneous
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Obsidian
Volcanic glass
igneous
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
N/A - Non-Geological Item
not a rock/mineral
Coal
Carbonaceous sedimentary rock
sedimentary
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Likely weathered iron-rich rock or slag fragment
Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)
mineral
Faience and Carnelian in Egyptian Revival Jewelry
Faience (quartz frit) and Carnelian (chalcedony, SiO2)
gemstone
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Obsidian
Volcanic Glass
igneous
Gold
Native Gold (Au)
mineral
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Serpentinite (likely serpentinized ultramafic rock)
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relict olivine/pyroxene
metamorphic
Pyrite (“fool’s gold”)
Pyrite, FeS₂; cubic iron sulfide
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Emerald In Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Emerald / Fluorite
Beryl (Be3Al2Si6O18) / Fluorite (CaF2)
mineral
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Obsidian
Volcanic glass (high silica content based on SiO2)
igneous