Diamond
Cubic carbon (C)
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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Sandstone
Arenite (SiO2 based)
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Copper
Native Copper (Cu)
mineral
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Granite
Intrusive Igneous Rock
igneous
Dark igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Diamond (Cut Gemstones in Jewelry)
Carbon (C)
gemstone
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Ferruginous Sandstone (ironstone)
Sandstone with iron oxide cement (limonite/hematite)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)
Meteorite (Silicate-Metal Matrix)
meteorite
Sandstone
Arenite
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Granite
Intrusive Igneous Rock
igneous
Quartzite pebble
Quartzite (SiO2 with iron oxide staining)
metamorphic
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Granite
Granite (a plutonic rock)
Igneous
Diamond
Carbon (C)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Blue Lace Agate
Chalcedony (SiO2) with trace inclusions
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Likely hematite-rich ironstone or metallic mineral fragment
Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
mineral
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Sandstone
Arenite
sedimentary