Rough Diamond (Bort)
Diamond (C)
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Learn about Mineral_rock in the encyclopedia
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Quartz Vein
Silicon Dioxide (SiO2)
Mineral
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Limonite/goethite-rich ironstone
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Purple amethyst crystal specimen
Amethyst, purple variety of quartz (SiO₂)
mineral
Possible weathered metallic mineral specimen
Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix
mineral
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Likely pyrite-bearing metamorphic rock
Quartz–mica schist or phyllite with disseminated pyrite (FeS₂)
metamorphic
Weathered iron-rich metamorphic rock, possibly schist or metabasalt
Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing
metamorphic
Iron-rich metamorphic rock (probable limonite/goethite-bearing schist)
Quartz–mica schist with iron oxyhydroxides, chiefly goethite (FeO(OH)) and limonite (amorphous hydrated iron oxides)
metamorphic
Fossilized bone fragment, possibly vertebra
Fossil bone (mineralized hydroxyapatite; exact taxon indeterminate)
fossil
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chalcopyrite in Quartz matrix
Chalcopyrite (CuFeS2) with secondary Malachite (Cu2CO3(OH)2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Druzy Quartz on Ironstone
Silicon Dioxide (SiO2) on Limonitic Ironstone
mineral
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Lapis Lazuli
Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Lapis Lazuli (Tumbled Specimen)
Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pink potassium feldspar (orthoclase/microcline)
KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz
mineral
Weathered basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz with Pyrite and Lichen
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Vanadinite on Barite
Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Biotite-rich gneiss
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky/included quartz
mineral
Orbicular granite (likely Rapakivi-type granite)
Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic