Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Weathered quartz-rich rock, likely quartzite or altered sandstone
Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph
metamorphic
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Quartzite
SiO2 (Silicon Dioxide)
metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Coquina
Bioclastic Limestone
sedimentary
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with tarnish
mineral
Quartz-rich pegmatite (possibly quartz–feldspar rock)
Granite pegmatite; chiefly quartz (SiO₂) with feldspar and minor mica/iron staining
igneous
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
metamorphic
Carnelian
Carnelian (SiO2 with iron oxide impurities)
mineral
Tumbled milky quartz
Quartz (SiO₂), microcrystalline or massive variety
mineral
Polished limestone or marble slab
Calcite-rich carbonate rock; likely marble (CaCO₃)
metamorphic
Tumbled greenish serpentine
Serpentinite; chiefly antigorite/lizardite, Mg₃Si₂O₅(OH)₄
metamorphic
Amber (Copal)
Succiniferous Resin
mineraloid
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Rock Salt (Halite)
Halite (Sodium Chloride, NaCl)
mineral
Serpentinized ultramafic rock (likely serpentinite)
Serpentinite; chiefly serpentine-group minerals Mg₃Si₂O₅(OH)₄, with magnetite, olivine, and pyroxene remnants
metamorphic
Quartzite (River Cobble)
Quartzite (SiO2)
metamorphic
Tumbled pale quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Moonstone (with Tourmaline/Mica)
Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Mineral (specifically a variety of Chalcedony, which is a cryptocrystalline quartz)
Anthracite Coal
Anthracite (Carbon)
sedimentary
Anthracite Coal
Anthracite (Carbon rank)
sedimentary
Quartz (Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted) / White Sapphire / Goshenite
Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)
gemstone
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Tumbled milky quartz
Quartz, SiO₂
mineral
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Mica Schist
Mica Schist (with Muscovite)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Rough Green Tourmaline (Verdelite)
Elbaite (Complex Silicate) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
mineral