Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Granite
Granite (Felsic Intrusive)
igneous
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Limestone (Decorative Gravel)
Calcium Carbonate (CaCO3)
sedimentary
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Dragon Blood Jasper
Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Diorite
Diorite
igneous
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Basalt (with possible fine-grained mineralization)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Coquina or Fossilized Shell Aggregate
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Granite cobble
Granite
igneous
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Basalt with Quartz/Epidote Vein
Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)
igneous
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Mica Schist
Mica Schist (primarily Muscovite and Biotite phyllosilicates)
metamorphic
Granodiorite
Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)
igneous
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Basalt River Pebble
Basalt (extrusive igneous rock)
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Granite
Granite
igneous
Gravel (likely Basalt or Greywacke)
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Granite (Weathered)
Granitic intrusive rock
igneous
Granite
Granite (compositionally of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Porphyritic Basalt
Porphyritic Basalt (Mafic Volcanic Rock)
igneous
Fossilized Sea Urchin Spines
Echinoidea (Cidaroid spines)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Basalt with Quartz Veining
Mafic Volcanic Rock with Silicate Micro-veins
igneous
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
sedimentary
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary