Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Learn about Mineral Composite in the encyclopedia
View all →
Iron-oxide-stained rock with a pale mineral vein
Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Polished granite pebble
Granite, a quartz–feldspar plutonic rock
igneous
Sandstone with Quartz Vein
Quartz-veined Arenite (SiO2 in detrital quartz matrix)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pink Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Granite
Felsic intrusive igneous rock
igneous
Diamond (or Cubic Zirconia simulant)
Carbon (C) / Zirconium dioxide (ZrO2)
gemstone
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Likely garnet crystal (rough fragment)
Garnet group; possibly almandine, Fe₃Al₂(SiO₄)₃
mineral
Polished banded agate (likely laguna-style fortification agate)
Microcrystalline quartz, SiO₂; chalcedony with concentric bands
mineral
Banded metamorphic rock, likely gneiss
Foliated quartz–feldspar rock (gneiss; exact identification requires closer examination)
metamorphic
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Granite Pebble
Granite
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Tumbled pink granite
Granite, composed mainly of quartz, potassium feldspar, plagioclase, and dark mica or amphibole
igneous
Tumbled quartz-rich pebble (likely quartzite or vein quartz)
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Fluorite with Quartz
Fluorite (CaF2) and Quartz (SiO2)
mineral
Quartz and Mixed Minerals
Silicon Dioxide (SiO2)
mineral
Quartz with Associated Minerals
Silicon Dioxide (SiO2)
mineral
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Green schist
Chlorite–mica schist, likely containing quartz and feldspar
metamorphic
Tumbled green stone, possibly serpentine
Likely serpentine-group rock (mainly serpentine minerals; identification uncertain from the image)
metamorphic
Dark green schist (probable chlorite/actinolite schist)
Chlorite–actinolite schist; exact mineral identification requires testing
metamorphic
Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)·nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Red-and-green jasper
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides and possibly chlorite/epidote
mineral
Lapis Lazuli
Lazurite-rich metamorphic rock
metamorphic
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic