Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxides
mineral
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Gray/Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (specifically Gray Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
River Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Rose Quartz
Silicon dioxide / Quartz (SiO2)
mineral
Tanzanite (Blue Zoisite)
Ca2Al3(SiO4)(Si2O7)O(OH) + (V) - Vanadium-bearing Zoisite
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Quartzite
Quartzite (mostly SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2 with minor impurities)
metamorphic
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
River Pebble (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Labradorite
Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8
mineral
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Beach Pebble (likely Quartz or Chalcedony)
Silicon Dioxide (SiO2)
Mineral
Vesicular Basalt with Oxidation
Scoriaceous Olivine Basalt (Mafic volcanic rock)
igneous
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Basalt
Basalt (Aphanitic extrusive igneous rock)
igneous
Milky Quartz (with Iron Oxide staining)
Quartz (Silicon Dioxide - SiO2)
mineral
Botryoidal Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Bixbyite on Rhyolite
Bixbyite (Mn2+,Fe3+)2O3
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Wishing Stone with Quartz Vein
Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)
metamorphic