Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Chrysocolla-bearing copper ore (tentative)
Chrysocolla, a hydrated copper silicate; commonly intergrown with quartz and/or other copper minerals
mineral
Mica Schist
Metamorphic rock dominated by micas (muscovite, biotite)
metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Possible weathered metallic mineral specimen
Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix
mineral
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Red Granite Pebble
Intrusive Felsic Igneous Rock (Granite)
igneous
Basalt
Basalt
Igneous
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Iron-stained brown mineral/rock fragment
Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing
mineral
Limonite
FeO(OH)·n(H2O)
mineral
Blue-gray mineral specimen (possibly sodalite)
Undetermined; appearance may be consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), but the image is insufficient for reliable identification
mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Likely milky quartz, possibly quartz-rich vein rock
Quartz (SiO₂); identification from the image is uncertain
mineral
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)
Granitic pegmatite; predominantly K-feldspar/plagioclase (KAlSi₃O₈–NaAlSi₃O₈), with quartz and dark mafic minerals
igneous
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Quartz-bearing pegmatitic rock with feldspar
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Granite
Intrusive igneous rock
igneous
Gneiss
Gneiss
metamorphic
Granite
Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica
igneous