Blue Calcite
Calcite (CaCO3)
mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
Learn about Organic Gem Material (Botanical) in the encyclopedia
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Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Blue Sapphire (Ceylon)
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Diamond (in a gold ring setting)
Carbon (C)
mineral
Amethyst
Amethyst (Silicon Dioxide containing trace Iron impurities, SiO2)
mineral
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Coquina
Bioclastic Limestone
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Ruby in Marble
Corundum (Al2O3) in Calcite (CaCO3) matrix
metamorphic
Garnet (Polished)
Nesosilicate (Group formula: X3Y2(SiO4)3)
gemstone
Amethyst
Amethyst (Varietal of Quartz), SiO2 with traces of Iron (Fe3+)
mineral
Amethyst (Tumbled Chips)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
White Sapphire
Corundum (Al2O3)
mineral
Amethyst and Limestone
Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)
The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Peridotite
Ultramafic intrusive rock (Peridotite)
Igneous
Watermelon Tourmaline in Quartz Matrix
Elbaite (complex Borosilicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sedimentary
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Mica (Lepidolite or Muscovite)
Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Tanzanite (Rough)
Blue Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Garnet (specifically Almandine or Pyrope)
Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Beryl (Emerald or Aquamarine in Matrix)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral