Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Cavansite
Cavansite (Ca(VO)Si4O10·4H2O)
mineral
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Chert (Grey Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2
Mineral
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Diamond
Carbon (C)
mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8
mineral
Smoky Quartz (with Hematite inclusions)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Amazonite (Green Feldspar)
Microcline (variety Amazonite), Chemical Formula: K(AlSi3O8)
mineral
Green Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Watermelon Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH
mineral
Amazonite
Potassium feldspar (Microcline), K(AlSi3O8)
mineral
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Beryl (Variety: Aquamarine/Green Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral