Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Category
Gemstone
Browse gemstone specimens identified by the Rock Identifier community.
Tiger's Eye
Silicon Dioxide with inclusions (SiO2)
mineral
Vesicular Basalt with Opal or Quartz
Vesicular Basalt (Amorphous SiO2.nH2O if Opal)
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Aquamarine (Rough)
Beryl (Be3Al2Si6O18)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium)
mineral
Green Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Mineral/Metamorphic rock
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz / Rose Quartz fragment
Silicon Dioxide (SiO2)
mineral
Amazonite
Microline Feldspar (KAlSi3O8)
mineral
Milky Quartz (or Iron-Stained Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)
metamorphic
White Quartz (Mushroom Carving)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Citrine (Quartz variant)
SiO2 (Silicon Dioxide)
mineral
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary
Obsidian
Obsidian (Amorphous volcanic glass, predominantly SiO2)
igneous
Amethyst
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Peach Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8) with inclusions
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite (Ca,Na)(Al,Si)4O8
mineral
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Potassium Feldspar)
Mineral