Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Category
Mineral And Glass
Browse mineral and glass specimens identified by the Rock Identifier community.
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Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Pale green rough mineral specimen, likely serpentine or calcite
Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃
mineral
Milky quartz cluster
Quartz (silicon dioxide, SiO₂), likely druzy or microcrystalline quartz
mineral
Red Tuff / Sandstone
Rhyolitic Tuff / Pyroclastic Volcanic Rock
igneous
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Quartz (Grain/Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Rose Quartz / Iron-stained Quartz
SiO2 (Silicon Dioxide)
mineral
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Milky quartz (quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineralogical glass/meteorite impactite
Pyrite and Quartz Agglomerate
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Milky Quartz with Pyrite and Iron Staining
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Mineral
Green Calcite or Prasiolite (Green Quartz)
Calcium carbonate (CaCO3) or Silicon dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
Mineral
Tumbled blue stone, likely blue aventurine or dyed quartz
Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing
mineral
Mica (Muscovite) in Granite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite inclusions)
mineral
Green Aventurine
Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chalcedony (Common Opal variant or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
White Quartz Pendant
Silicon Dioxide (SiO2)
mineral
Quartz pebble
SiO2
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral