Granite
Intrusive igneous rock
igneous
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
Learn about Mineral (Tectosilicate) in the encyclopedia
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Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Milky Quartz with Algae/Chlorite
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Milky quartz (rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Pebble with vesicles, likely basalt
Vesicular basalt; chiefly plagioclase, pyroxene, and iron-magnesium minerals
igneous
Likely amazonite-bearing pegmatite
Granite pegmatite containing amazonite (microcline feldspar, KAlSi₃O₈); exact identification is uncertain from the photo
igneous
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Weathered mica-rich schist (likely muscovite schist)
Muscovite–quartz schist; chiefly muscovite mica and quartz, with possible feldspar and iron-bearing minerals
metamorphic
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Quartz with Sulfide Inclusions
Silicon Dioxide (SiO2) with metallic mineral inclusions
mineral
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Serpentine (likely serpentinite)
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly with magnetite and minor brucite
metamorphic
Small weathered fossil or mineral fragment
Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral
fossil
Quartz Cluster and Associated Minerals
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (likely biotite–quartz–feldspar gneiss)
Foliated gneiss; primarily quartz (SiO₂), feldspar, and biotite mica
metamorphic
Unidentified metallic mineral or meteorite fragment
Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment
mineral
Weathered mica schist (tentative)
Mica schist, likely muscovite–biotite schist with quartz and feldspar
metamorphic
Likely sulfur-bearing rock (possibly native sulfur)
Native sulfur (S), though the image alone cannot confirm the specimen’s identity
mineral
Likely rough yellow-green gemstone, possibly peridot
Peridot (gem-quality olivine), (Mg,Fe)₂SiO₄ — identification is uncertain from the photo
gemstone
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Gneiss
Gneiss
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Gneiss
Gneiss
metamorphic
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Weathered basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products
igneous