Granite
Phaneritic Igneous Rock (Granite)
igneous
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
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Olivine (Peridotite)
Magnesium iron silicate ((Mg, Fe)2SiO4)
igneous
Pegmatitic quartz–feldspar rock with dark mica
Granitic pegmatite; quartz (SiO₂), feldspar, and biotite mica
igneous
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
White Quartz Star
Silicon Dioxide (SiO2)
mineral
Chalcedony in Matrix (likely Agatized Coral or Chert)
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Light-colored weathered stone, possibly limestone or quartz-rich rock
Indeterminate; likely calcitic limestone (mostly CaCO₃) or quartz sandstone (SiO₂)
sedimentary
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Weathered iron-rich rock, possibly laterite or ironstone
Goethite–hematite-rich ferruginous rock; uncertain without testing
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Jasper (brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides and other impurities
mineral
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Gossan (with secondary copper minerals)
Iron-rich oxidized rock cap (Limonite/Goethite with Malachite/Chrysocolla inclusions)
metamorphic
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysoprase (Nickel-bearing Chalcedony)
Silicon Dioxide (SiO2) with traces of Hydrous Nickel Silicates
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Red jasper (likely tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Yellow Jasper
Silicon dioxide (SiO2)
mineral
White-veined gray limestone or marble
Calcite-rich carbonate rock; likely calcitic marble (CaCO₃)
metamorphic
Mica Schist with Biotite or Muscovite
Metamorphic rock rich in sheet silicates
metamorphic
Dinosaur Bone (Petrified/Agatized)
Permineralized Dinosauria Bone (Silicate Replacement)
fossil
Lapis Lazuli
Complex silicate rock (lazurite, pyrite, calcite)
gemstone
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper (specifically Red Jasper or Iron-stained Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite
mineral
Rhodonite
Inosilicate (Manganese Iron Magnesium Calcium Silicate, (Mn,Fe,Mg,Ca)SiO3)
mineral
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Milky Quartz
Silicon dioxide (SiO2)
mineral
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Porphyritic Andesite
Andesite (with white Plagioclase phenocrysts)
igneous