Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Gneiss
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Basalt with Caliche
Extrusive Mafic Igneous Rock with Secondary Carbonate Crust
igneous
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
igneous
Porphyritic Rhyolite (Red)
Rhyolite (Porphyry)
igneous
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
sedimentary
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Lapis Lazuli
Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)
Metamorphic rock / Mineral variety
Beryl (Emerald or Aquamarine in Matrix)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Red Jasper (Heliotrope family variant)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Yellow Jasper
Silicon Dioxide with Iron inclusions (SiO2)
sedimentary
Fluorite (Purple variety)
Calcium Fluoride (CaF2)
mineral