Mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Fluorite

Calcium Fluoride (CaF2)

Chrysocolla with Malachite

Cu2-xAlx(H2-xSi2O5)(OH)4%CnH2O (Chrysocolla)

Weathered granite (probable)

Granite; a coarse-grained rock composed chiefly of quartz, feldspar, and mica

Nephrite Jade

Nephrite

Polished green tumbled stone, likely serpentine

Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)

Limonite with Quartz

Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)

Quartz-rich pegmatite with black tourmaline

Granitic pegmatite composed chiefly of quartz, with black tourmaline (schorl); possibly feldspar

Small water-worn pebble, likely granite or granitic rock

Granite (tentative; exact identification is uncertain from the photo)

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Likely garnet gemstone

Garnet-group silicate; species cannot be determined from the photo (common red varieties include almandine, Fe₃Al₂(SiO₄)₃, and pyrope, Mg₃Al₂(SiO₄)₃).

Fluorite

Calcium Fluoride (CaF2)

Polished heart-shaped serpentine (likely)

Serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄

Limonite

FeO(OH)·nH2O

Pale green stone, possibly serpentine

Serpentinite (dominantly serpentine-group minerals; visual identification is uncertain)

Rounded granitic pebble

Granite, a quartz–feldspar-rich plutonic rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Pink granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Green Fluorite

Calcium Fluoride (CaF2)

Shark Tooth Fossil

Vertebrate fossilized tooth

Small rounded pebble (rock type indeterminate)

Unidentified lithic pebble; specific composition cannot be determined from the image

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Small gray-green tumbled stone, likely serpentine

Serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification is uncertain from the image alone

Limonite

FeO(OH)•nH2O

Orthoclase Feldspar (Granitic)

KAlSi3O8 (Potassium Feldspar)

Likely serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Fluorite

Calcium Fluoride (CaF2)

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix

Likely rough garnet crystal

Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃)

Weathered, iron-stained granite (possible granitic gneiss)

Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)