Mineral Health

Limonite with Quartz

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

Granite

Intrusive Igneous Rock (Felsic)

Fluorite

Calcium Fluoride (CaF2)

Blue Apatite

Calcium Fluorophosphate - Ca5(PO4)3F

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Shark Tooth Fossil

Vertebrate fossilized tooth

Chrysocolla with Malachite

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

Limonite

FeO(OH)·nH2O

Marble

Recrystallized Calcite (CaCO3)

Fluorite

Calcium Fluoride (CaF2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pyrite in Quartz Matrix

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

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Green Fluorite

Calcium Fluoride (CaF2)

Lepidolite

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

Quartz Vein Rock

Silicon dioxide (SiO2) within a host rock matrix

Green Apatite on Albite

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

Orthoclase Feldspar (Granitic)

KAlSi3O8 (Potassium Feldspar)

Limonite

FeO(OH)•nH2O

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Fluorite

Calcium Fluoride (CaF2)

Limonite

FeO(OH)·n(H2O)

Biotite Schist

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

Banded Gneiss (River Rock/Pebble)

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

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Epidote

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

Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)

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

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

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

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Quartz with Sericite and Cinnabar

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

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

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)

Chalcopyrite

Copper iron sulfide (CuFeS2)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)