Granite or Pegmatite with Tourmaline
Granitic Pegmatite
igneous
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Quartz Geode
Silicon Dioxide (SiO2) in Geode formation
mineral
Basalt
Basalt
igneous
Aventurine
Quartz (SiO2 with fuchsite inclusions)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fire Agate
Silicon Dioxide (Chalcedony with Limonite inclusions), SiO2
gemstone
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Feldspar
Feldspar Group (Tectosilicate)
mineral
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Yellow Jasper
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite inclusions
sedimentary
Fossilized Shark Tooth
Elasmobranchii fossil (likely Odontaspididae family)
sedimentary
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Quartz Pebble with Chlorite or Epidote Inclusions
Silicon Dioxide (SiO2) with inclusions
metamorphic
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Pink Granite
Felsic intrusive igneous rock
igneous
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic structure
mineral
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Corundum
Aluminium oxide (Al2O3)
mineral
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Geode (unopened nodule)
Silicon Dioxide (SiO2) Nodule
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Silicon Carbide (Carborundum)
Moissanite (SiC), though mostly synthetic
mineral
Vanadinite
Pb5(VO4)3Cl
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Schist (Garnet-Mica Schist)
Garnet-Mica Schist
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral