Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Category
Man Made Mineral Simulant (Glass)
Browse man made mineral simulant (glass) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 principal)
sedimentary
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Pebble)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Jasper mix)
Cryptocrystalline Sillimanite (Quartz) - SiO2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (orange-red chalcedony)
Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety
gemstone
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
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
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Likely polished garnet fragment
Garnet group, possibly almandine (Fe₃Al₂Si₃O₁₂)
gemstone
Aventurine
Aventurine Quartz (SiO2)
mineral
Rose quartz (polished fragment)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral