Mixed

Gold Flakes

Native Gold (Au)

Graphite

Graphite (Carbon, C)

Graphite

Graphite (Native Carbon, C)

Agate and Chalcedony

Silicon Dioxide (SiO2)

Dyed and polished gemstone chips

Mostly chalcedony (microcrystalline quartz, SiO₂), with probable amethyst and agate varieties

Pyrite in Quartz

FeS2 (Iron Pyrite) with SiO2 (Quartz)

Lapis lazuli rough

Lapis lazuli, a rock composed mainly of lazurite (Na₃CaAl₃Si₃O₁₂S) with calcite and commonly pyrite

Muscovite-rich mica schist

Mica schist, chiefly muscovite [KAl₂(AlSi₃O₁₀)(OH)₂], possibly with quartz and feldspar

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Granite fragment

Granite; predominantly quartz (SiO₂), feldspar, and mica

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Granite

Felsic intrusive igneous rock

Lapis Lazuli

Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite (Gneissic Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Unakite

Unakite (Metasomatized Granodiorite)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Granodiorite

Granodiorite (containing Plagioclase, Quartz, K-Feldspar, and Hornblende or Biotite)

Pink Granite

Granite (rich in Potassium Feldspar/Orthoclase)

Weathered quartz-rich pebble, possibly quartzite or granite fragment

Quartzite (mostly SiO₂), though the specimen may contain feldspar and other silicates

Chrysocolla

Chrysocolla (Cu2–xAlx(H2–xSi2O5)(OH)4·nH2O)

Conglomerate

Conglomerate

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Chrysocolla in Quartz

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O in Quartz (SiO2)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Pebble with dark mineral inclusion

Likely granitic or gneissic quartz–feldspar pebble with a mafic inclusion; exact identification requires testing

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar

Lapis lazuli bead bracelet

Lazurite-bearing calcite–pyrite rock; lazurite formula (Na,Ca)₈(AlSiO₄)₆(S,SO)₂

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

K-feldspar Granite / Red Granite Fragment

Alkali feldspar granite (Plutonic igneous rock)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Unakite

Epidotized Granite

Chrysocolla

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

Polished chrysocolla specimen

Chrysocolla, a hydrated copper silicate; commonly intergrown with quartz, malachite, or other copper minerals

Chalcedony (likely carnelian/agate beads or rounded grains)

Microcrystalline quartz, SiO₂; chalcedony varieties