Mineral (Metal)

Dark mafic rock, possibly basalt or meteorite-like specimen

Likely basalt (plagioclase–pyroxene assemblage); meteorite identification cannot be confirmed visually

Opalite

Opalescent Glass (SiO2 + coloring agents)

Emerald (green gemstone) pendant

Emerald, green variety of beryl (Be₃Al₂Si₆O₁₈); stones appear to be faceted and set in jewelry

Lapis lazuli bead bracelet

Lapis lazuli, chiefly lazurite (Na₃Ca(Si₃Al₃)O₁₂S); commonly with calcite and pyrite

Native gold-bearing quartz vein specimen

Native gold (Au) in quartz, with possible iron-oxide and sulfide minerals

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Dalmatian Stone

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)

Blue-green gemstone cabochon, likely turquoise or chrysocolla

Turquoise: CuAl₆(PO₄)₄(OH)₈·4H₂O; chrysocolla: hydrated copper aluminosilicate (variable composition)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Black tourmaline (schorl) crystal fragments

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Copper-bearing oxidized rock

Likely malachite–chrysocolla with limonite/goethite in a weathered host rock; exact identification requires testing

Fluorite (often called Rainbow Fluorite or Purple-Green Fluorite)

Calcium Fluoride (CaF2)

Iron-oxide-stained rock fragment, possibly ironstone

Indeterminate iron-rich rock; iron oxides/hydroxides such as hematite (Fe₂O₃) or goethite (FeO(OH)) may provide the rusty coloration

Tumbled turquoise-colored stone pendant

Undetermined; possibly dyed howlite or magnesite, or turquoise

Possible industrial slag or basaltic volcanic glass

Likely iron-rich vitreous slag; natural alternative: basaltic glass (tachylite)

Gold and Silver (Metal Components of an Antique Pocket Watch)

Native Gold (Au) and Native Silver (Ag)

Purple Lepidolite with Quartz

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz (Druzy / Goldstone Gemstone Cabochon)

Silicon Dioxide (SiO2)

Quartzite

Quartzite

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Small metallic mineral specimen, possibly pyrite

Pyrite (FeS₂), tentative identification

Native bismuth

Bismuth (Bi), commonly forming hopper crystals or aggregates

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

Gold-bearing quartz vein rock (likely pyrite-rich quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂); gold cannot be confirmed visually

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Quartz-rich pegmatite with mica

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and muscovite/biotite mica

Vintage-style bracelet with likely black onyx and yellow-and-white jasper or agate cabochon

Onyx (cryptocrystalline quartz, SiO₂); central stone appears to be patterned jasper or agate (chalcedony, SiO₂), though identification from the image is uncertain

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Turquoise cabochon ring

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

Quartz vein in dark host rock

Milky quartz (SiO₂) in an unidentified dark metamorphic host, possibly amphibolite or schist

Limonite (Iron Ore)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Bornite

Copper Iron Sulfide (Cu5FeS4)

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Polished banded agate (probable)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Quartz–iron-oxide breccia or weathered quartz-bearing rock

Quartz (SiO₂) with limonite/goethite and possibly iron sulfides in a brecciated host

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)