Man Made Metamorphic Style Composite

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Diamond

C (Native Carbon)

Diamond

Natural Diamond (Carbon, C)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Quartzite

Metamorphic Rock (composed primarily of Quartz, SiO2)

Quartzite Cobble

Metamorphic rock primarily composed of Quartz (SiO2)

Quartzite (River-worn)

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartzite

Metamorphic rock primarily composed of Quartz (SiO2)

Red Quartzite River Stone

Metamorphic Rock (composed mainly of Quartz, SiO2)

Yellow Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Sandstone

Arenite (SiO2 principal)

Swirled Agate Bead

Silicon Dioxide (SiO2)

Diamond (or Diamond Simulant)

Carbon (C)

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Dalmatian Stone

Peralkaline Quartz-Feldspar Rock

Diamond (Cut Gemstone)

Natural Carbon (C)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Granite Pebble

Granite

Pearls (likely freshwater cultured pearls)

Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Peridotite (Dunite)

Olivine-rich Peridotite ((Mg,Fe)2SiO4)

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Tumbled purple quartzite

Quartzite; predominantly crystalline SiO₂ with minor iron-oxide or other mineral impurities

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dalmatian Stone and Lapis Lazuli

Dalmatian Stone (peralkaline rock) with Lapis Lazuli (metamorphic rock)

Basalt with Epidote (Porphyry)

Basalt (with inclusions of Epidote/Feldspar)

Likely schist, possibly serpentinite

Mica schist; potential chlorite–serpentine-rich metamorphic rock

Coquina / Fossiliferous Limestone

Fossiliferous Limestone (Calcite, CaCO3)

Flint

Silicon Dioxide (SiO2) - Chert variety

Pearl (Biogenic Mineraloid)

Calcium carbonate (Aragonite) and Conchiolin, CaCO3

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Chert (often called Flint for darker varieties)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

White Jade (Nephrite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)

Fossil Shark Tooth

Carcharodon carcharias (modern/recent) or similar Lamniform fossil

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Granite

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

Quartzite

Quartz-rich metamorphic rock; chiefly SiO₂

Quartzite

Quartzite (primarily SiO₂)