Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Category
Organic Gemstone (Not A Rock)
Browse organic gemstone (not a rock) specimens identified by the Rock Identifier community.
Anthracite Coal
Anthracite
metamorphic
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Amber
Succinite (fossilized resin)
mineral
Amber
Fossilized Resin (C10H16O)
mineral
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
metamorphic
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)
mineral
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Moonstone (specifically Cat's Eye or Gray Moonstone)
Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Labradorite
Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony
Mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Iron Oxide impurities)
Mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Jasper Pebble
Tumbled Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Red Jasper (possibly Petrified Wood)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary (secondary formation)
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Citrine
Silicon Dioxide (SiO2)
Mineral
Pyrite in Limestone
Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)
mineral
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Amazonite
K(AlSi3O8) - Potassium Feldspar (Microcline variant)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Black Jasper
Silicon Dioxide (SiO2) with Carbonaceous inclusions
sedimentary
Emerald (Tumbled Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Carnelian
Carnelian (SiO2 - Silicon Dioxide)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Pumice
Pumicite (Amorphous glass with varying chemical composition, often rhyolitic)
Igneous
Dendritic Opal (Merlinite)
Hydrated Silica with Manganese/Iron oxide inclusions (SiO2·nH2O)
mineral