Schist/Phyllite
Metamorphic Schist (Chlorite Schist variety)
metamorphic
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
Learn about Mineral Specimen in the encyclopedia
View all →
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
Pyrite-bearing quartz vein rock
Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Granite Cobble
Phaneritic Plutonic Felsic Rock
igneous
Pink Tourmaline in Quartz Matrix
Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Garnet Schist
Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Chert (with Iron Staining)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Bixbyite on Rhyolite
Bixbyite (Mn2+,Fe3+)2O3
mineral
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Pegmatitic granite, possibly potassium-feldspar-rich
Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende
igneous
Lepidolite
K(Li,Al)_3(Si,Al)_4O_10(F,OH)_2 (Lithium-bearing Mica)
mineral
Druzy Quartz (on Quartzite or Chert)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Amethyst
Quartz variety; SiO2 (Silicon Dioxide)
Mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Pink Tourmaline (Rubellite)
Rb:Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite variety)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Celadonite in Amygdaloidal Basalt
K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2 (Celadonite mineral) within a Basalt matrix
igneous
Greenish calcite (likely), possibly talc-bearing marble
Calcite, CaCO₃; green coloration may reflect chlorite, epidote, or serpentine inclusions
mineral
Polished/tumbled calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Beryllonite
Beryllonite (NaBePO4)
mineral
Quartz-rich pegmatite with mica and dark inclusions
Pegmatite; chiefly quartz (SiO₂), with feldspar and biotite/tourmaline inclusions
igneous
Chalcopyrite
CuFeS2 (Copper Iron Sulfide)
mineral
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
sedimentary
Astrophyllite
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
mineral
Fuchsite
Chromian Muscovite, K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Arsenic (Native)
Arsenic (As)
mineral