Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Rounded granite or granitic gneiss cobble
Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)
igneous
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 with KAlSi3O8)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz crystals on matrix
Silicon dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Blue sodalite-bearing rock, likely sodalite in nepheline syenite
Sodalite (Na₈Al₆Si₆O₂₄Cl₂), possibly in nepheline syenite
mineral
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz geode / iron-stained quartz vein rock
Quartz (SiO₂), likely with iron oxides and minor feldspar or host-rock minerals
mineral
Amber
Succinite (C10H16O)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral