Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Igneous, Metamorphic, And Sedimentary
Browse igneous, metamorphic, and sedimentary specimens identified by the Rock Identifier community.
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Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Gneiss Pebble
Gneiss
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Pink Gneiss / Pink Granite Gneiss
Felsic Gneiss (dominated by Orthoclase Feldspar and Quartz)
metamorphic
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
High-grade foliated metamorphic rock
metamorphic
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Pyrite
Iron Disulfide (FeS2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
metamorphic
Cloudy Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Magnetite-rich Iron Ore
Magnetite (Fe3O4)
mineral
Garnet
Almandine-Pyrope group, X3Y2(SiO4)3
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Rhodonite, Gray Moonstone, and White Feldspar Mix
Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)
mineral
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Gneiss
Gneiss
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Feldspathic Gneiss
Feldspathic Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic