Green Opal
Hydrated amorphous silica (SiO2·nH2O) with inclusions
Category
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
Green Opal
Hydrated amorphous silica (SiO2·nH2O) with inclusions
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Pink Tourmaline (Rubellite)
Elbaite (Tourmaline group) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
Quartz
Silicon Dioxide (SiO2)
Green Aventurine
SiO2 (Silicon Dioxide) with Fuchsite inclusions
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz, Sandstone, and Siltstone specimens
Silicon Dioxide (SiO2) and Clastic Sedimentary Rocks
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Quartz pebble with iron inclusion
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Quartzite
Quartzite (primarily SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
Fossil Coral
Rugosa or Tabulata / Hexacorallia (replaced with silica or calcite)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Blue-green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
Moldavite
Tektite (Natural Silicate Glass)
Orange Calcite (Banded Calcite)
Calcium Carbonate (CaCO3)
Quartz Vein Rock
Silicon Dioxide (SiO2)
Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
Blue Calcite
Calcium Carbonate (CaCO3)
Quartz Pebble
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, manganese, or iron
Quartz
Silicon Dioxide (SiO2)
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2 with iron oxide impurities)
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
Quartz (Quartzite fragment)
Silicon Dioxide (SiO2)
Serpentinite
Serpentinite (complex silicate mineral group (Mg,Fe)3Si2O5(OH)4)
Chert (Flint) Pebble
Microcrystalline Quartz (SiO2)
Jasper
Silicon Dioxide (SiO2)
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si)4O10(F,OH)2)
Banded Iron Formation
Banded Iron Formation (BIF)
Banded Iron Formation (BIF)
Banded Iron Formation (principally Hematite/Magnetite and Chert)
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
Petrified Wood
Silicified Wood (primarily SiO2)
Sandstone (with Iron Staining)
Arenite
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group