Basalt
Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine
Igneous
Category
Mineral Like (Anthropogenic)
Browse mineral like (anthropogenic) specimens identified by the Rock Identifier community.
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Strawberry Quartz (or Sunstone / Tumbled Quartz)
Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions
mineral
Flower Agate (Cherry Blossom Agate)
Chalcedony (Silicon Dioxide) with Opaque Inclusions - SiO2
mineral
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral: Fluorapatite)
mineral
Granite
Felsic intrusive igneous rock
igneous
Septarian Nodule (Sphere)
Septarian (composed of Calcite, Aragonite, and Limestone/Claystone)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
fossil
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Fancy Jasper (Bloodstone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Quartz Geode Fragment
Silicon dioxide (SiO2) within a nodule
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartzite with Garnet inclusion
Metamorphic Quartz-rich Rock
metamorphic
Adventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Iron Meteorite
Meteoritic Iron (Fe-Ni alloy)
meteorite
Granite
Intrusive igneous rock
igneous
Granite
Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)
igneous
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Granite Glacial Cobble
Granite
igneous
Gneiss
Gneiss
metamorphic
Granodiorite
Phaneritic Plutonic Intermediate-Felsic Rock
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Granite
Granite (High-silica plutonic rock)
igneous
Schist (Garnet-Mica Schist)
Garnet-Mica Schist
metamorphic
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
mineral