Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Biogenic Sediment Or Biological Remain)
Browse sedimentary (biogenic sediment or biological remain) specimens identified by the Rock Identifier community.
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
mineral
Quartz (Microcrystalline variety)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Yellow Chert (Jasper)
Chalcedony (SiO2) with iron oxide inclusions
sedimentary
Jasper River Pebble
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Red Jasper (possibly Carnelian)
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian and Green Calcite
Volcanic Glass and Calcium Carbonate (CaCO3)
igneous and sedimentary/mineral
Quartz (Milky/Common)
Quartz (Silicon Dioxide, SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Ferruginous Sandstone (Ironstone)
Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))
sedimentary
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Yellow Aventurine (or Citrine-colored Quartz)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Agate (Carnelian-like)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian)
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral