Granite
Phaneritic Felsic Igneous Rock
igneous
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Graphite
Graphite (C)
mineral
Mica Schist
Mica Schist (Quartz-Biotit-Muscovite Schist)
metamorphic
Mica Schist
Schist (muscovite-biotite rich)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Diorite
Diorite
igneous
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Basalt (River Pebble)
Extrusive Mafic Igneous Rock
igneous
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Granite fragment
Granite
igneous
Basalt (River Pebble)
Mafic volcanic rock (rich in magnesium and iron)
igneous
Micaceous Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz with Mica (Schist/Pegmatite fragment)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
igneous/metamorphic
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)
There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).
Mineral
Muscovite Mica (in Quartz/Feldspar Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Mica Schist with Pyrite
Muscovite/Biotite Schist with Iron Sulfide (FeS2)
metamorphic
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Basalt
Extrusive Mafic Igneous Rock
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Basalt with Quartz Veins
Mafic Igneous Rock with Quartz (SiO2) intrusions
igneous
Basalt
Mafic Extrusive Igneous Rock
Igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Granodiorite
Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)
igneous
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Mica Schist
Mica Schist (predominantly composed of Muscovite or Biotite silicates)
metamorphic
Gneiss (with Quartz and Biotite Mica)
Gneiss
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Basalt
Basalt
igneous
Diorite river pebble
Diorite (intermediate plutonic rock)
igneous
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
Igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Ferruginous Sandstone (Grit)
Clastic Sedimentary (Ironstone-rich Sandstone)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt
Basalt
igneous
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary