Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Gold Mineral
Native Gold (Au)
mineral
Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Concrete
Anthropogenic Conglomerate
sedimentary
Sulfur on Quartz
Native Sulfur (S8) with Quartz (SiO2)
mineral
Greenstone Pebble
Metabasalt (often containing chlorite, actinolite, or epidote)
metamorphic
Ferruginous Sandstone
Arenite with Iron-oxide cement
sedimentary
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Granite with Epidote
Phaneritic intrusive igneous rock with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Amber / Copal
Succinite (fossilized tree resin)
mineraloid
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Schist
Schist (Metamorphic Rock)
metamorphic
Banded Carnelian Agate
Silicon Dioxide (SiO2)
sedimentary
Basalt (Vesicular/Weathered)
Mafic Igneous Rock (Mainly Plagioclase and Pyroxene)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Breccia
Breccia
sedimentary
Chiastolite
Andalusite (Al2SiO5) with carbonaceous inclusions
metamorphic
Tourmalinated Quartz
Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Dendritic Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
African Turquoise (Jasper)
Impure variety of silica, primarily Quartz (SiO2) with various inclusions
sedimentary
Schist
Schist (variety likely Mica Schist)
metamorphic
Quartz with Iron Stains
Silicon Dioxide (SiO2) with FeOx inclusions
mineral
Amethyst (Super Seven / Melody's Stone Variety)
Silicon Dioxide (SiO2) with trace impurities including Iron
mineral
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Quartz Crystal (Rough)
Silicon Dioxide (SiO2)
mineral
Carnelian and Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite and Limonite inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rainbow Lattice Sunstone (Matrix)
Orthoclase Feldspar (containing Hematite and Magnetite)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral