Man Made (Synthetic Rock)

Corundum (variety Ruby/Sapphire)

Aluminum Oxide (Al2O3)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Smoky Quartz

Silicon Dioxide (SiO2)

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Yellow-orange faceted gemstone, likely citrine or yellow topaz

Citrine: quartz, SiO₂; yellow topaz: Al₂SiO₄(F,OH)₂

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Diamond

Diamond (pure native carbon, C)

Granite

Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)

Tiger Shark Fossil Tooth

Galeocerdo cuvier (fossilized)

Rose Quartz

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon ≥ 86%)

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Yellow Sapphire

Corundum (Al2O3:Fe)

Citrine

Citrine (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Smoky Quartz (with Druzy/Polished Edge)

Smoky Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium trace elements)

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

Turquoise (likely stabilized or simulated Howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Sapphire (likely blue synthetic sapphire or blue glass in a ring)

Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.

Ruby (Faceted)

Corundum (Al2O3 with Cr trace elements)

Diamond

Diamond (C)

Opal

Hydrated amorphous form of silica (SiO2·nH2O)

Diamond

Carbon (C)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Quartz (Pebble)

Quartz (SiO₂)

Sodium Polyacrylate (Superabsorbent Polymer)

Sodium Polyacrylate [-CH2-CH(COONa)-]n

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Amethyst

SiO2 (Silicon Dioxide)

Silicon

Element Si

Diamond (Faceted)

Diamond (Pure Carbon, C)

Strawberry Quartz (or Rose Quartz / Cherry Quartz)

Silicon Dioxide (SiO2) with Lepidocrocite, Hematite, or Goethite inclusions