Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
Learn about Mineral Like Byproduct (Technogenic) in the encyclopedia
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African Turquoise
Jasper / Quartz matrix (Trade name: African Turquoise, chemically a form of microcrystalline quartz with various mineral inclusions)
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase Feldspar, and Biotite/Mica)
igneous
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)
mineral
Red Jasper
Cryptocrystalline Quartz (SiO2 with Iron oxide inclusions)
sedimentary
Garnet (Almandine-Pyrope)
Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3
mineral
Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Sandstone (River Cobble)
Clastic Sandstone (SiO2 with accessory minerals)
sedimentary
Coral Fossil (Scleractinia)
Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with iron oxide cement (Fe2O3)
sedimentary
Chromite
Chromite (FeCr2O4)
mineral
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Limonite-coated Shale
Ferruginous Siliciclastic Shale
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Rutile in Quartz (Rutilated Quartz)
SiO2 with TiO2 inclusions
Mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Agate (specifically, a slice of a Blue Lace or Chalcedony Agate nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz arenite)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Obsidian (Black Obsidian)
Obsidian (Volcanic Glass)
igneous
Banded Sandstone (Differential Weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Moss Agate Geode Sphere
Silicon Dioxide (SiO2) - Chalcedony with Chlorite or Manganese inclusions
mineral
River Cobble (Quartz-rich Sandstone)
Arenite with iron oxide staining
sedimentary
Greenstone / Epidosite
Epidosite (primary minerals: Epidote and Quartz)
metamorphic
Milky Quartz (with Chlorite/Mineral Inclusions)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (Mn, Fe, Mg, Ca)SiO3
mineral
Tangerine Quartz
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Oco Geode
Silicon Dioxide (SiO2) with various inclusions
mineral
Conglomerate
Sedimentary Conglomerate
sedimentary
Red Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Blue Quartzite
Metamorphosed Quartz (SiO2) with inclusions
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite phyllosilicates)
metamorphic