Quartzite
Quartzite (SiO2 principal component)
metamorphic
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
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Tumbled River Pebble (Quartzite / Agate)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with various inclusions
Mineral, variety of Quartz
Slag (Industrial Glass)
Anthropogenic Vitreous Slag (Post-industrial byproduct)
igneous
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Granite
Granite (Felsic Intrusive)
igneous
Yellow-orange faceted gemstone, likely citrine or yellow topaz
Citrine: quartz, SiO₂; yellow topaz: Al₂SiO₄(F,OH)₂
gemstone
Tourmalinated Quartz / Tourmaline in Matrix
Silicate mineral group (Schorl / Quartz)
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Multi-gemstone Quartz and Fluorite Bracelet
Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)
mineral
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Quartz-rich vein rock, likely milky quartz in weathered host rock
Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining
igneous
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Dragon Vein Agate (Dyed/Fractured Quartz)
Silicon dioxide (SiO2)
gemstone
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Amethyst (Large Cluster)
Silicon Dioxide (SiO2) with iron impurities
gemstone
Red Jasper
Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)
sedimentary
Rough Diamond
Diamond (Native Carbon, C)
mineral
Cobaltian Calcite (Cobaltoan Calcite)
Cobalt-bearing Calcite (Ca,Co)CO3
mineral
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Double-Terminated Quartz (SiO2)
mineral
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Smoky Quartz in Matrix (Pegmatite)
Silicon Dioxide (SiO2) with Potassium Feldspar and Biotite mica
igneous
Tektite (Indochinite)
Tektite (Amorphous silica glass, SiO2 with impurities)
meteorite
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish
mineral
Granite
Granitoid
igneous
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Generic Rock Fragment
Rock Fragment
sedimentary
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Limonite/goethite-rich ironstone (probable)
Limonite, chiefly hydrated iron oxides; commonly goethite, α-FeO(OH), with possible quartz or host-rock inclusions
mineral
Bornite (“peacock ore”), likely weathered copper sulfide
Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish
mineral
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary