Mocha Stone (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
sedimentary
Category
Mineral Like (Anthropogenic)
Browse mineral like (anthropogenic) specimens identified by the Rock Identifier community.
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Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Vanadinite
Lead Chlorovanadate - Pb5(VO4)3Cl
mineral
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Desert Rose (Sand Barite/Gypsum Rose)
Barium Sulfate (BaSO4) or Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Banded Gneiss
Gneiss
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Dinosaur Skin Fossil
Fossilized dermis / epidermal impression
fossil
Sandstone
Arenite
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz with Chlorite inclusions
Silicon Dioxide (SiO2) with Chlorite group minerals (hydrous magnesium iron alumino-silicate)
mineral
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Igneous
Limonite (Yellow Ochre)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Mica (Muscovite) in Granite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2)
sedimentary
Leopardite
Porphyritic Quartz Monzonite or Rhyolite
igneous
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Pegmatite
Coarse-grained igneous rock
igneous
Pegmatite with Tourmaline
Pegmatite / Silicate
igneous
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Limonite
FeO(OH)•nH2O
mineral
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz
Quartz (SiO₂)
Mineral
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Peacock Ore
Bornite (Cu5FeS4)
mineral
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Garden Quartz (Lodolite / Inclusion Quartz)
Quartz with inclusions (SiO2 with various mineral inclusions)
gemstone
Azurite in Matrix
Azurite (Cu3(CO3)2(OH)2) in Rhyolite or Sandstone matrix
mineral