Snowflake Obsidian
Volcanic Glass (SiO2 with Cristobalite inclusions)
igneous
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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Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz / Citrine Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Citrine (tumbled)
Silicon dioxide, SiO2
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineralogical glass/meteorite impactite
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Green Aventurine (Propably a tumbled variety)
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
mineral
Slag Glass (Cullet Glass)
Amorphous Silica (Industrial byproduct)
mineral
Amber
Succinite (Carbon-based organic compound; approximate formula C10H16O)
Mineraloid
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Quartz Crystal (Citrine / Golden Quartz)
Silicon Dioxide (SiO2)
mineral
Pale blue-gray quartz-rich pebble (tentative)
Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Diamond
Carbon (C)
mineral
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Citrine or Yellow Quartz
Quartz (SiO2) with iron impurities
mineral
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine / Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Strawberry Quartz
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Polished Black Onyx (or Obsidian)
Silicon Dioxide (SiO2)
mineral
Pink Tumbled Agate
Silicon Dioxide (SiO2) with dye
mineral
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Dyed Quartz Pendant
Silicon Dioxide (SiO2) with artificial dye
mineral
Yellow Quartz
SiO2 (Crystalline Silicon Dioxide)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz pebble in concrete
Quartz (SiO₂), embedded in Portland-cement concrete
mineral
Blue Topaz
Al2SiO4(F,OH)2
mineral