Granite
Phaneritic plutonic igneous rock (SiO2 range 65-75%)
igneous
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia
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Gold Ore / Native Gold
Native Gold (Au)
mineral
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
N/A - Non-Geological Item
not a rock/mineral
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
igneous
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Limonite host rock
mineral
Gold Nugget
Native Gold (Au)
mineral
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Azurite in Matrix
Azurite (Cu3(CO3)2(OH)2) in Rhyolite or Sandstone matrix
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Greywacke
Dirty Sandstone (Lithic wacke)
sedimentary
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Native Copper
Native Copper (Cu)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Malachite or Chrysocolla on Host Rock
Cu2(CO3)(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Jadeite
NaAlSi2O6; Jadeite silicate mineral
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite (with Pyrite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Sandstone (with potential iron mineralization)
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Orthoclase Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenstone / Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidite Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH) and Quartz)
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Quartz (Yellow/Tan Quartzite Pebble)
Silicon Dioxide (SiO2)
metamorphic