Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Fluorite
Fluorite (CaF₂)
mineral
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite
sedimentary
Rutilated Quartz
Quartz (SiO2) with Rutile inclusions (TiO2)
Mineral
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Gneiss
Gneiss
metamorphic
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Goethite (likely as part of Limonite/Ironstone)
Goethite (α-FeOOH)
Mineral
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Amber
Succinicum (C10H16O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Quartz
Quartz (SiO₂)
Mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Dalmation Jasper (Dalmation Stone)
Perthitic feldspar-quartz-amphibole rock
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Amber
Succinite
Organic Gemstone (sedimentary associations)
Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fluorite (Green)
Calcium Fluoride (CaF2)
mineral
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary