White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
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River Cobble (Sandstone)
Arenite / Quartz Sandstone
sedimentary
Iron-stained weathered volcanic rock (probable basalt/andesite)
Altered basaltic–andesitic rock, chiefly plagioclase and pyroxene with iron oxides/hydroxides
igneous
Feldspar (Orthoclase/Microcline)
Potassium Feldspar (KAlSi3O8)
mineral
Quartz (Milky/Gray variety)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Fluorite (Rainbow Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartz-rich breccia or vein quartz with dark inclusions
Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals
igneous
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Gold-bearing Quartz (Auriferous Quartz)
Quartz (SiO2) with native Gold (Au) inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz geode or druzy quartz specimen
Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock
mineral
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Raw yellow calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Weathered serpentinite (likely serpentine-rich rock)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite and accessory minerals
metamorphic
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Greenstone (likely serpentinite or greenstone pebble)
Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite
metamorphic
Unakite
Unakite (Metasomatized Granite)
metamorphic
Red Jasper (Opaque Chalcedony)
Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions
mineral
Likely serpentine (serpentinite) pebble
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly with magnetite and minor carbonate
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fluorite Tower
Calcium Fluoride (CaF2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with native Au)
mineral
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Schist
Mica Schist
metamorphic
Tumbled pale greenish stone, likely serpentine or altered limestone
Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Calcium fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Blue Quartzite (Aventurine variety)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic