Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Quartz / Common Gravel
Silicon Dioxide (SiO2)
mineral
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Beach Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sunstone
Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
Sunstone
Oligoclase (Plagioclase Feldspar Group) - (Ca, Na)(Al, Si)4O8
mineral
Unakitized Granite
Granite / Altered Monzonite with Epidote
igneous
Sandstone with Quartz Vein
Arenite with hydrothermal quartz intrusion
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt (or Porfido / Porphyry Beach Pebble)
Porphyritic Basalt / Andesite
igneous
Sandstone
Arenite (typically SiO2 based)
sedimentary
Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Quartzite Pebble (with mineral veining)
Metamorphic Quartzite (SiO2)
metamorphic
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Yellowish variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Red jasper (iron-rich chalcedony), possibly brecciated
Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides
mineral
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Moldavite
Moldavite (Silica-rich glass, SiO2 + Al2O3)
tektite
Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Shale
Mudrock / Fissile Shale
sedimentary
Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Sandstone
Arenite (SiO2 primarily)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral