Gneiss
Gneiss
Category
Browse not a rock (animated character) specimens identified by the Rock Identifier community.
Gneiss
Gneiss
Schist
Mica Schist
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Milky Quartz
Silicon Dioxide (SiO2)
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
Rose Quartz
Quartz (Silicon Dioxide) - SiO2
Yellow Jasper with Dendritic Inclusions
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
Chert (Flint)
Microcrystalline Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
Moss Agate
Silicon Dioxide (SiO2) with inclusions
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Amethyst
Amethyst (Silicon Dioxide, SiO2)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Carnelian (Agate/Chalcedony)
Silicon Dioxide (SiO2)
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
Agate Geode
Microcrystalline Quartz (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron inclusions
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Rainbow Moonstone
White Labradorite (formula: (Na,Ca)(Al,Si)4O8)
Quartz / Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
Schist
Mica Schist
Jasper and Quartzite mix
Silicon Dioxide (SiO2) with impurities
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
Pink Quartzite
Quartzite (primarily SiO2)
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Sandstone
Arenite (SiO2 primarily)
Greenstone
Greenschist / Meta-basalt
Amethyst
Amethyst (Varietal of Quartz), SiO2 (Silicon Dioxide)
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
Granite
Phaneritic Granitoid (Primary minerals: Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Mica)
Quartzite
Quartzite (SiO2)
Citrine
Quartz (SiO₂)