Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
mineral
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
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Agate Nodule (partially vuggy Quartz)
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Jasper
Jasper (SiO2)
sedimentary
Jasper or Agate with Chlorite Inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Pink Fluorite
Fluorite (Calcium Fluoride) - CaF2
mineral
Conglomerate
Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)
sedimentary
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
Mineral / Sedimentary Rock
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper or Agate pendant
Silicon dioxide (SiO2)
Mineral
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
mineral
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with impure Iron oxides
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Jasper with Iron Staining
Silicon Dioxide (SiO2) with impurities
sedimentary
Jasper
Silicon Dioxide (SiO2)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
sedimentary
Red Jasper
Quartz (SiO2) with iron oxide inclusions
sedimentary
Pyrite
Iron Pyrite (FeS2)
Mineral
Marble
Metamorphosed Limestone (calcite formulation CaCO3)
metamorphic
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
mineral
Amazonite
Microcline (KAlSi3O8) with trace Lead (Pb)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Litharenite)
sedimentary
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Selenite (Gypsum Variety)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Satin Spar Selenite (Gypsum)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral