Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Category
Mineral And Glass
Browse mineral and glass specimens identified by the Rock Identifier community.
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Sand Fulgurite
Lechatelierite (Silica glass tube)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Schorl (Black Tourmaline)
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Milky Quartz with inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Sand
Siliciclastic sediment / Quartz sand (SiO2)
sedimentary
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz (Pink/Orange Variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Amethyst
Silicon dioxide with iron impurities (SiO2 + Fe3+)
mineral
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + trace Fe3+)
mineral
Ferruginous Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
White Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Polished Mexican “Crazy Lace” agate tower
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
River Pebble (likely Quartzite or Quartz)
Quartzite (SiO2)
metamorphic
Sandstone
Quartz Arenite / Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Green glass-like cabochon, likely synthetic glass or resin
Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin
gemstone
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Quartz with Metallic Inclusion
Silicon Dioxide (SiO2) with associated metallic sulfide or oxide
mineral
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
River Quartzite Slik
Quartzite (SiO2)
metamorphic
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz with Epidote / Serpentine (Vein Quartz)
SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral