Iron Meteorite (likely Chondrite or Iron-Nickel fragment)
Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy
igneous
Category
Man Made Object (Simulant)
Browse man made object (simulant) specimens identified by the Rock Identifier community.
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Blue Lace Agate (Heat-treated/Crackle Quartz variety)
Silicon Dioxide (SiO2)
mineral
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Indian Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Yellow Quartzite (River Stone)
Quartzite (composed primarily of Quartz: SiO2)
metamorphic
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Biotite / Black Mica
Biotite K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Prase Quartz on Feldspar
Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)
mineral
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Hematite
Ferric oxide (Fe2O3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Vesicular Basalt (Mafic volcanic rock)
Igneous
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Sandstone
Arenite (a specific type of sandstone with less than 15% matrix)
Sedimentary rock
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Diamond
Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.
Mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Gneiss
Gneiss (pronounced 'nice')
Metamorphic Rock