Quartz
Silicon Dioxide (SiO2)
Mineral
Category
Man Made Object (Metal Alloy)
Browse man made object (metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Metal Alloy) in the encyclopedia
View all →
Unidentified Small Rock
Unknown
undetermined
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Iron Meteorite (likely an Individual specimen)
Iron Meteorite (Group IAB, IIAB, IIIAB, etc., Fe-Ni alloy)
igneous
Chondrite Meteorite
Ordinary Chondrite (Fe-Ni alloy, Olivine, Pyroxene)
Mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Iron-Nickel Meteorite
Siderite (Iron Meteorite), primarily Fe-Ni alloy
igneous
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
N/A (Non-Geological Object)
N/A
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Quartz Crystal
Quartz (SiO₂)
Mineral
Likely galena-bearing ore specimen
Galena (PbS), possibly with quartz or calcite gangue
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gold Nugget
Gold (Au)
mineral
Arsenic (Native)
Arsenic (As)
mineral
Polished blue banded agate slice
Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements
mineral
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Iron Meteorite
Siderite (Fe, Ni)
igneous
Emerald / Fluorite
Beryl (Be3Al2Si6O18) / Fluorite (CaF2)
mineral
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Galena
Galena (lead sulfide, PbS)
mineral
Psilomelane (Manganese Ore)
Psilomelane (Ba,H2O)2Mn5O10
mineral
Iron Meteorite (Fragment)
Siderite (Iron-Nickel alloy: Kamacite and Taenite)
igneous
Iron-rich meteorite candidate
Undetermined; possible stony-iron or iron meteorite, commonly kamacite–taenite (Fe–Ni)
meteorite
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Fossilized tooth, likely mammalian molar
Indeterminate Mammalia; mineralized dentine and enamel
fossil
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Granodiorite
Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)
igneous
Honey-colored chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; orange chalcedony colored by iron oxides
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Iron Meteorite (Campo del Cielo)
Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)
igneous
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Rainbow aura quartz cluster
Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film
mineral
Likely metallic mineral specimen
Probably galena (lead sulfide, PbS), though visual identification is uncertain
mineral
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
SiO₂ (Silicon Dioxide)
Mineral