Agate
Chalcedony (SiO2)
Category
Browse sedimentary or igneous specimens identified by the Rock Identifier community.
Agate
Chalcedony (SiO2)
Quartz
Silicon Dioxide (SiO2)
Agate
Silicon Dioxide (Chalcedony), SiO2
White Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
Pyrite
Iron Pyrite (FeS2)
Yellow Quartz
Silicon Dioxide (SiO2)
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
Agate
Silicon dioxide (Chalcedony), SiO2
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Agate
Silicon dioxide (chalcedony variety), SiO2
Quartz
Silicon Dioxide (SiO2)
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
Quartz
Silicon Dioxide (SiO2)
White Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
Muscovite
KAl2(AlSi3O10)(OH)2
Quartz
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Carnelian Agate
Cryptocrystalline Quartz (SiO2) with Iron Oxide impurities
Gneiss
Gneiss
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
Clear Quartz / Rock Crystal
Silicon Dioxide (SiO2)
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Chalcedony (specifically Agate and Carnelian variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Clear Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)