Petrified Wood
Silicified wood (permineralized wood)
fossil
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
Learn about Mineral, Jewelry in the encyclopedia
View all →
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Oligoclase or Andesine) - (Na,Ca)(Si,Al)3O8
mineral
Amethyst Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Hexagonaria or Rugose coral fossil (replaced by silica/chalcedony)
fossil
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine)
Fe3Al2(SiO4)3
mineral
Garnet in Matrix
Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix
metamorphic
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Petrified Wood
Silicified Wood (mainly Quartz / SiO2)
fossil
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Labradorite (Polished Tumbled Stone)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Amethyst (Rough)
Amethyst (SiO2 with Iron impurities)
mineral
Moldavite
Moldavite (Silica-rich glass, SiO2 + Al2O3)
tektite
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Diamond (or Simulant)
Carbon (C)
gemstone
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium or Manganese
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone