Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Mineral
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
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Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Basalt
Basalt (Mafic Extrusive)
igneous
Phantom Quartz with Chlorite and Hematite inclusions
Silicon Dioxide (SiO2) with inclusions of Chlorite group minerals and Hematite (Fe2O3)
mineral
Pyrite-rich Gossan
Iron Sulfide (FeS2) in Ore Matrix
mineral
Smoky Quartz (Faceted Beads)
Silicon Dioxide (SiO2)
mineral
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Black Marble
Recrystallized Calcite (CaCO3)
metamorphic
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Marble (White)
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Red/Green Brecciated)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
mineral
Tiger's Eye
Silicified Riebeckite Asbestos (SiO2 with Iron Oxide inclusions)
mineral
Yellow Quartzite
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Quartzite
Quartzite (SiO2-dominant rock)
metamorphic
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Tiger's Eye (Brown/Gold variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
metamorphic
Quartzite
Quartzite (mainly SiO2)
metamorphic
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tiger's Eye
Quartz (SiO2) with fibrous inclusions of Altered Crocidolite
mineral
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite with Schist Inclusions
Metamorphosed Quartzite (SiO2) with minor mica/chlorite schist
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert Pebble / Brachiopod Fossil Internal Mold
Silicon Dioxide (SiO2) / Fossil: Brachiopoda (generic internal mold)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic