Mineral (Evaporite)

Chrysocolla with Malachite

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

Fluorite

Calcium Fluoride (CaF2)

Shark Tooth Fossil

Vertebrate fossilized tooth

Limonite

FeO(OH)·nH2O

Pyrite in Quartz Matrix

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

Biotite Schist

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

Green Apatite on Albite

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

Green Fluorite

Calcium Fluoride (CaF2)

Turquoise (Blue Howlite / Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Lepidolite

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

Epidote

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

Desert Rose (Gypsum Rose)

Gypsum (CaSO4·2H2O) with inclusions of sand

Desert Rose

Baryte (BaSO4) or Gypsum (CaSO4·2H2O) with sand inclusions

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Orthoclase Feldspar (Granitic)

KAlSi3O8 (Potassium Feldspar)

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

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Likely serpentine

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

Fluorite

Calcium Fluoride (CaF2)

Limonite

FeO(OH)•nH2O

Possible weathered metallic mineral specimen

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

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

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

Quartz with Sericite and Cinnabar

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

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Limonite

FeO(OH)·n(H2O)

Iron-stained brown mineral/rock fragment

Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)

Granitic pegmatite; predominantly K-feldspar/plagioclase (KAlSi₃O₈–NaAlSi₃O₈), with quartz and dark mafic minerals

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin