Gabbro (Water-Worn Pebble)
Gabbro (Plagioclase Feldspar and Pyroxene)
igneous
Category
Mineral Variant
Browse mineral variant specimens identified by the Rock Identifier community.
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Magnetite
Magnetite (Fe3O4)
mineral
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Raw greenish-blue quartz-bearing mineral specimen
Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests
mineral
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Quartz–calcite sulfide-bearing mineral specimen
Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gypsum (Selenite sand)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Blue-green glassy mineral specimen, likely aquamarine or pale fluorite
Tentatively beryl (Be₃Al₂Si₆O₁₈), aquamarine variety; identification is uncertain from the photograph
mineral
Erythrite in Cobaltite Ore
Erythrite (Co3(AsO4)2·8H2O) with Cobaltite (CoAsS)
mineral
Tumbled serpentine (likely bowenite)
Serpentine-group minerals, chiefly antigorite/lizardite; commonly Mg₃Si₂O₅(OH)₄
metamorphic
Likely pink granite
Granite, a coarse-grained felsic intrusive igneous rock, typically quartz + feldspar + mica
igneous
Polished rhyolite (likely rainforest jasper)
Rhyolite, a silica-rich volcanic rock; exact identification cannot be confirmed from the photo
igneous
Granite (likely weathered)
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Tumbled pink granite
Granite (quartz, feldspar, and mica; exact variety uncertain)
igneous
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Granite
Felsic intrusive igneous rock
igneous
Nephrite Jade
Nephrite
Mineral/Rock
Pearl jewelry
Pearl (biogenic calcium carbonate, primarily aragonite, CaCO₃)
gemstone
Quartz crystal cluster (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂), with possible iron-oxide inclusions
mineral
Blue apatite (likely dyed or enhanced)
Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (likely Granitic Gneiss)
Gneiss
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Quartz-rich pegmatite, likely with iron staining
Granitic pegmatite, chiefly quartz (SiO₂) and feldspar, with possible mica and iron oxides
igneous
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic