Kyanite
Aluminum Silicate, Al2SiO5
mineral
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
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Pegmatite
Granitic pegmatite, composed mainly of quartz and feldspar with possible mica
igneous
Amygdaloidal Basalt with Quartz Veining
Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining
igneous
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Granite with Mafic Xenolith
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Likely serpentinite (serpentine-rich rock)
Serpentinite, composed mainly of serpentine-group minerals (lizardite, antigorite, or chrysotile); identification from the photo is tentative.
metamorphic
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Basalt with an orange mineral vein
Fine-grained basalt, likely containing iron-stained calcite or zeolite; exact identification requires testing
igneous
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Fluorite (Rainbow, Purple-Blue Tumbled)
Calcium Fluoride (CaF2)
Mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Greenstone (likely chlorite- or actinolite-rich metabasalt)
Metamorphosed mafic volcanic rock; commonly greenschist-facies basalt, composed chiefly of chlorite, actinolite, epidote, and albite
metamorphic
Rounded dark-gray rock, likely diorite or andesite
Probable diorite (plagioclase and hornblende/pyroxene); identification is limited by the image
igneous
Likely banded gneiss
Foliated quartz–feldspar gneiss, with dark biotite or amphibole
metamorphic
Exposed shoreline bedrock and sediment
Unidentified natural rock; the image does not show enough detail for a specific geological identification
sedimentary
Granite pebble
Granite; predominantly quartz, feldspar, and mica
igneous
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Fluorite (specifically Blue John or Banded Fluorite)
Calcium Fluoride (CaF2)
mineral
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Likely rough garnet
Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Granite with Mineral Vein
Plutonic Igneous Rock
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Green jade-like cabochon pendant
Unidentified green gem; possibly jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
gemstone
Peach-colored feldspar fragment
Likely potassium feldspar (orthoclase or microcline; KAlSi₃O₈)
mineral
Milky quartz (rough quartz specimen)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz Mineral
Silicon dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Green fluorite (likely rough specimen)
Fluorite, calcium fluoride (CaF₂)
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Gold Mineral
Native Gold (Au)
mineral
Red garnet crystal cluster
Most likely almandine garnet, Fe₃Al₂(SiO₄)₃; exact species cannot be confirmed from the image alone.
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Green glass-like mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass
mineral