Fluorite (Green Fluorite on Host Rock)
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Gemstone
Browse gemstone specimens identified by the Rock Identifier community.
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Staurolite (Fairy Stone)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Hypersthene
Hypersthene (Magnesium Iron Silicate - (Mg,Fe)SiO3)
mineral
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Chert (specifically Red Chert / Jasper nodule)
Silicon dioxide (SiO2)
sedimentary
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2 with iron oxide impurities)
sedimentary
Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Greenstone
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
sedimentary
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8), specifically Microcline
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Serpentine (Greenstone)
Antigorite, Lizardite, and Chrysolite mixture (Mg3Si2O5(OH)4)
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Rough Green Tourmaline (Verdelite)
Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
igneous
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Indigo Gabbro
Gabbro (Mafic Intrusive Rock)
igneous
White Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Obsidian
Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)
igneous