Diorite
Phaneritic Intermediate Igneous Rock
igneous
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Granite
Granite (Felsic Plutonic Rock)
igneous
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Magnetite (Lodestone variant potential)
Magnetite (Fe3O4)
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Small pink mineral fragment
Indeterminate; possibly rose quartz or feldspar
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Quartz geode
Microcrystalline and crystalline quartz (SiO₂), likely chalcedony-lined geode
mineral
Vesicular basalt pebble
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Pegmatitic granite
Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and mica
igneous
Foliated metamorphic rock (likely mica schist)
Mica schist, typically composed of quartz and mica (muscovite and/or biotite)
metamorphic
Likely pegmatite with quartz and mica
Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica
igneous
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz with a dark mineral inclusion
Milky quartz, likely containing a dark amphibole or tourmaline inclusion
mineral
Small brown mineral fragment
Unidentified; the image lacks enough detail for a reliable species-level identification
mineral
Gemstone Ring
Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)
gemstone
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)
mineral
Unidentified coarse-grained rock fragment, possibly granite
Possible granite: quartz, feldspar, and dark mica or amphibole; identification is uncertain from the image
igneous
Likely native silver-bearing ore or silver-colored metallic mineral specimen
Uncertain from the photo; possible native silver (Ag) with iron-oxide-stained host rock
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Vanadinite
Pb5(VO4)3Cl
mineral
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Chrysocolla (or Turquoise/Aventurine)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Stalagmite (Flowstone)
Speleothem (Calcium Carbonate, CaCO3)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
Polished smoky quartz
Quartz (SiO₂), smoky variety
mineral
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral