Sedimentary (Processed Mineral Product)

Zircon

Zirconium Silicate (ZrSiO₄)

Weathered limestone or concrete-like calcareous rock

Limestone; predominantly calcite (CaCO₃), possibly containing dolomite and silicate impurities

Gold-bearing Quartz Vein in Mafic Rock

Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)

Gold-bearing sulfide ore (tentative)

Native gold, likely with pyrite/chalcopyrite in quartz or altered rock

Tumbled Hematite with Quartz/Chert (Specular Hematite)

Fe2O3 (Iron Oxide)

Galena (likely)

Galena, lead sulfide (PbS)

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Copper-bearing rock, possibly native copper in a weathered matrix

Likely copper minerals such as malachite (Cu₂CO₃(OH)₂) in an iron-rich host; exact identification is uncertain from the image

Likely copper-bearing rock (oxidized copper ore)

Unidentified copper minerals, possibly malachite and cuprite; the image is insufficient for a precise identification

Sandstone Pebble

Arenite (predominantly SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Green Calcite

Calcium Carbonate (CaCO3)

Likely iron sulfide specimen (pyrite or marcasite)

Pyrite, FeS₂; possibly marcasite, also FeS₂

Brown shale or mudstone fragment

Likely fissile claystone/shale, composed mainly of compacted clay minerals, quartz, and minor iron oxides

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tumbled or broken translucent quartz-like fragment

Quartz (silicon dioxide, SiO₂), possibly chalcedony or calcite

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Slate

Metamorphic rock (fine-grained, foliated)

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Granite

Granite (Felsic Intrusive)

Iron-rich sulfide ore, likely pyrite-bearing gossan

Pyrite (FeS₂), possibly mixed with iron oxides/hydroxides and other sulfides

Quartz pebble

Quartz (Silicon Dioxide, SiO2)

Likely polished greenstone or serpentine inlay

Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade

Tumbled carnelian agate

Microcrystalline quartz (chalcedony), SiO₂; iron-oxide colored

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite

Phaneritic Felsic Igneous Rock

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled amethyst

Amethyst, purple quartz (SiO₂), colored mainly by iron-related defects

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Magnetite

Iron(II,III) oxide, Fe3O4

Green Jadeite

NaAlSi2O6 (Sodium Aluminum Silicate)

Hematite pseudomorph after a fossil or mineralized object (likely iron-oxide concretion)

Hematite, Fe₂O₃, possibly limonite/goethite-bearing

Likely muscovite-bearing mica schist

Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂) and quartz; exact identification is uncertain from the image alone.

Tumbled aqua glassy mineral specimen, likely chrysocolla or turquoise imitation

Uncertain from image; possible chrysocolla (hydrated copper aluminosilicate, variable composition) or dyed/man-made glass

Iron-rich breccia (hematite–goethite rock)

Hematite (Fe₂O₃) and goethite (FeO(OH)) ironstone, likely ferruginous breccia

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Rock Specimen

Unclassified rock specimen

Quartz

Silicon Dioxide (SiO2)

Blue-dyed magnesite beads (often sold as “turquoise howlite”)

Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅