Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
Browse anthropogenic (man made product subject to geological processes) specimens identified by the Rock Identifier community.
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Eclogite
Eclogite
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Mineral
Chert with Desert Varnish
Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Petoskey-style)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Specular Hematite with Quartz
Ferric oxide (Fe2O3) and Silicon dioxide (SiO2)
Mineral
Rough Diamond
Diamond (Pure Carbon: C)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite (Oolitic or Earthy variety)
Iron(III) oxide (Fe2O3)
mineral
Turquoise color-bead and Hematite necklace
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary