Chert (and associated Sedimentary rocks)
Microcrystalline Silica (SiO2)
sedimentary
Category
Mineral, Specifically A Cryptocrystalline Quartz Variety
Browse mineral, specifically a cryptocrystalline quartz variety specimens identified by the Rock Identifier community.
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Amazonite
Amazonite / Microcline (KAlSi3O8)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Quartzite
Meta-quartzite with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)
metamorphic
Red Sandstone
Sandstone (mainly SiO2 with Iron Oxide cement)
sedimentary
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
mineral
Chert (within Asphalt)
Chert (SiO2)
sedimentary
Mookaite Jasper
Silicified Porcellanite (SiO2 with impurities)
sedimentary
Amethyst (Pale/Light Variety)
Quartz (Silicon Dioxide) with Iron impurities - SiO2
mineral
Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Vesicular Basalt (River Pebble)
Vesicular Basalt
igneous
Pallasite Meteorite
Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)
Mineral/Extraterrestrial Rock
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Jasper or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Indian Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chert
Chert (microcrystalline quartz, SiO2)
sedimentary
Massive Cryptocrystalline Quartz (Chert/Chalcedony Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (often referred to as Flint or Jasper)
Chalcedony (SiO2) - Silicon Dioxide
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Pink Dyed Agate (Banded Chalcedony)
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Marble
Metamorphosed Limestone (calcite formulation CaCO3)
metamorphic
Amygdaloidal Rhyolite
Amygdaloidal Rhyolite (Felsic volcanic rock)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Quartz (Drusy/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (varietal Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral