Green Aventurine
SiO2
Category
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
Green Aventurine
SiO2
Pyrite in Matrix
Iron Sulfide (FeS2) embedded in host rock
White Buffalo Turquoise (or Howlite/Magnesite)
Calcite/Dolomite or Magnesite with Chert/Quartz inclusions
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) - Limestone
Banded Iron Formation
Banded Iron Formation (BIF)
Red Jasper
Silicon Dioxide with Iron inclusions (SiO2)
Quartz-veined Chert
Silicon dioxide (SiO2)
Oolitic Limestone / Fossiliferous Chert
Oolitic Limestone (CaCO3) / Silicified Limestone
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with impurities)
Quartzite Pebble
Quartzite
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
Quartzite Pebbles
Quartzite (SiO2)
Quartzite Cobble
Quartzite (SiO2)
Greenstone / Greenschist
Greenschist (metamorphosed mafic rock)
Quartzite
Quartzite (primarily SiO2)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
River Quartzite
Metamorphosed Quartz Sandstone (SiO2)
Quartzite
Quartzite (mostly SiO2)
Quartzite
Quartzite (composed primarily of Silica, SiO2)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartzite
Quartzite (SiO2)
Yellow Quartzite (Iron-Stained Quartz)
Quartzite (SiO2 with Fe-oxide impurities)
Quartzite Pebbler
Quartzite (SiO2)
Quartzite (River Pebble)
Quartzite (SiO2)
Quartzite
Quartzite (SiO2)
Quartzite
Quartzite (primarily SiO2)
Serpentine (likely serpentinite)
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and chromite
Copper-bearing schist (likely bornite/chalcopyrite ore)
Micaceous schist with sulfide minerals, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz Pebble
Silicon Dioxide (SiO2)
Banded Chert
Microcrystalline Quartz (SiO2)
Hematite
Hematite (Fe2O3)
Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
Quartz (Gray/Smoky Variety)
Silicon Dioxide (SiO2)
Gold
Native Gold (Au)
Quartzite Pebble
Quartzite (primarily SiO2)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Quartz / Quartzite
Silicon Dioxide (SiO2)