Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Basalt
Mafic Igneous Rock
igneous
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Pink Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Pearls
Aragonite (calcium carbonate) and Conchiolin
Mineraloid
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Gold
Native Gold (Au)
mineral
Gold Nugget / Gold Flakes
Native Gold (Au)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Gravel (likely Basalt or Greywacke)
Basalt (Mafic volcanic rock)
igneous
Kimberlite with Diamonds
Kimberlite (ultramafic potassic igneous rock)
igneous
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Gold Nugget
Native Gold (Au)
mineral
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Gold Ore (in Quartz/Gossan matrix)
Native Gold (Au) in Limonite/Quartz matrix
mineral
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Pegmatite (Granite Pegmatite)
Intrusive Igneous Rock (Granite Pegmatite)
igneous
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Beryl (Aquamarine) in Matrix with Schorl
Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Banded Calcite (Tumbled)
Calcium Carbonate (CaCO3)
Mineral
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Silver (S925)
Native Silver (Ag)
mineral
Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Olivine (Peridotite)
Magnesium iron silicate ((Mg, Fe)2SiO4)
igneous
Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Turritella Agate (Elimia Agate)
Silicified Elimia tenera (formerly misidentified as Turritella)
sedimentary (silicified fossiliferous chalcedony)
Quartz
Quartz (SiO2)
Mineral