Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite with Rhodochrosite
Fluorite (CaF2) and Rhodochrosite (MnCO3)
Mineral
Amber
Succinite (Fossilized Resin C10H16O)
Organic Mineraloid
Chert with Quartz Vein
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Amazonite
K(AlSi3O8)
mineral
Amethyst Geode
Amethyst/Purple Quartz (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Sunstone
Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Amazonite
Microcline (KAlSi3O8 with lead impurities)
mineral
Cat's Eye Chrysoberyl
Chrysoberyl (BeAl2O4)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Amazonite
Microcline (variety of Feldspar), K(AlSi3O8)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Amethyst
Silicon dioxide / Quartz (SiO2+Fe4+)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Granite (Weathered)
Course-grained Intrusive Igneous Rock
igneous
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Diamond
Native Carbon (C)
mineral
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Chert (Commonly known as Flint or Jasper when pigmented)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood (Calamites Fossil)
Calamites sp. (Silicified/Permineralized Plant Fossil)
sedimentary