Mixed

Chrysocolla in Matrix

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Copper-stained quartz/igneous rock specimen

Quartz (SiO₂), with secondary copper minerals; host likely altered volcanic rock

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Polymict conglomerate

Clastic conglomerate, likely polymictic and matrix-supported

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Quartz-rich polymict conglomerate (possibly hydrothermal breccia)

Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts

Iron-rich laterite or limonite/goethite concretion

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)

Iron-rich concretion (probable limonite/goethite concretion)

Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Assorted polished river pebbles

Mixed lithologies, likely quartzite, chert, jasper, and weathered igneous/metamorphic rocks

Tumbled carnelian and agate

Microcrystalline quartz (chalcedony), SiO₂; iron-bearing varieties include carnelian

Weathered quartzite cobble

Quartzite, predominantly crystalline SiO₂

Polished agate/jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with likely iron-oxide and clay inclusions

Tumbled hematite (likely hematite-rich iron oxide)

Hematite, Fe₂O₃; possibly mixed with magnetite, Fe₃O₄

Polished pink-and-gray stone, likely rhodonite

Rhodonite (manganese inosilicate, MnSiO₃), possibly mixed with quartz or feldspar

Botryoidal aragonite (cave calcite/aragonite formation)

Aragonite, CaCO₃; possibly mixed with calcite and iron-oxide staining

Blue-and-yellow sodalite-bearing rock (likely sodalite in nepheline syenite)

Sodalite, Na8(Al6Si6O24)Cl2, likely mixed with feldspar and/or nepheline

Polished red jasper with quartz/chalcedony

Jasper (microcrystalline quartz, SiO₂), locally mixed with chalcedony or quartz

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly mixed with hematite or metallic sulfides

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly mixed with marcasite or another iron sulfide

Magnetite-rich black sand

Magnetite (Fe₃O₄), likely mixed with other heavy minerals

Hematite-rich ironstone concretion

Hematite (Fe₂O₃), likely mixed with goethite/limonite and silica

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

Botryoidal hematite/goethite specimen

Hematite (Fe₂O₃), likely mixed with goethite (FeO(OH))

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with sulfide minerals

Polished copper-bearing mineral specimen, likely malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite

Limonite (Iron Ore)

Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Silver (Sterling Silver)

Argentum (Ag) mixed with Copper (Cu); Formula: Ag+Cu

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

Pumice

Vesicular volcanic glass (Amorphous silica mixed with various oxides)

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Epidote in Quartz

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) mixed with SiO2

Colorless faceted gemstone, likely cubic zirconia

Synthetic cubic zirconia (zirconium dioxide, ZrO₂); identity is visual and not definitive

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Iron-rich ochre (red/brown hematite pigment)

Hematite, Fe₂O₃, likely mixed with clay and quartz grains

Metallic sulfide ore, possibly pyrite-rich

Pyrite (FeS₂), potentially mixed with chalcopyrite, galena, or iron oxides

Metallic sulfide mineral specimen, likely pyrite

Pyrite (iron disulfide, FeS₂), possibly mixed with marcasite or chalcopyrite