Mineral (Man Modified)

Polished ocean jasper (orbicular jasper), likely

Silica-rich microcrystalline quartz/chalcedony aggregate, commonly with feldspar, epidote, and iron oxides; composition varies

Weathered iron-rich concretion (probable limonite/goethite)

Limonite–goethite aggregate, approximately FeO(OH)·nH₂O

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Limonite) inclusions

Quartz

Quartz (SiO₂)

Botryoidal Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite

Iron Sulfide (FeS2)

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Fluorite (Green)

Calcium Fluoride (CaF2)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Tumbled White Quartz

Silicon Dioxide (SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Purple fluorite cluster with metallic sulfide inclusions

Fluorite, calcium fluoride (CaF₂), likely with pyrite or chalcopyrite inclusions

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Tumbled pale quartz/chalcedony fragment

Quartz (SiO₂), possibly microcrystalline chalcedony

Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Fluorite (Calcium Fluoride) - CaF2

Limonite (often after Pyrite)

Limonite (FeO(OH)·nH2O)

Fluorite

Calcium Fluoride (CaF2)

Tumbled metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂) with associated sulfides and host rock; exact identification requires testing

Banded Gneiss

Gneiss (pronounced 'nice')

Iron-rich weathered stone, possibly limonite/goethite

Limonite (mixture of hydrated iron oxides), commonly goethite (α-FeO(OH))

Fluorite on Matrix

Calcium Fluoride (CaF2)

Petrified Wood

Silicified Wood (primarily SiO2)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂)

Purple Fluorite Octahedron

Fluorite (Calcium Fluoride, CaF2)

Green Calcite

Calcium Carbonate (CaCO3)

Green Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Limonite (Iron Ore)

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Turquoise cabochon

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Serpentinite with carbonate veins

Serpentinite; chiefly serpentine-group minerals (antigorite/lizardite, Mg₃Si₂O₅(OH)₄) with white calcite or magnesite veins

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)