Likely serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄
metamorphic
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Fluorite
Calcium Fluoride (CaF2)
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Iron-stained brown mineral/rock fragment
Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Mica Schist
Metamorphic rock dominated by micas (muscovite, biotite)
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Limonite
FeO(OH)·n(H2O)
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)
Granitic pegmatite; predominantly K-feldspar/plagioclase (KAlSi₃O₈–NaAlSi₃O₈), with quartz and dark mafic minerals
igneous
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar with Quartz
Orthoclase (KAlSi3O8)
mineral
Likely fluorescent mineral specimen
Uncertain; possibly willemite (Zn₂SiO₄) or fluorite (CaF₂)
mineral
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Yooperlite (Sodalite-bearing Syenite)
Sodalite-rich Syenite
igneous
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)
Quartz variety (SiO2) / Polycrystalline Quartz Aggregate
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Granite
Intrusive igneous rock
igneous
Gneiss
Gneiss
metamorphic
Apatite
Ca5(PO4)3(F,Cl,OH)
mineral