Synthetic (Not A Rock Or Mineral)

Cubic Zirconia (CZ) Jewelry

Zirconium dioxide (ZrO2)

Clear quartz sphere or polished quartz cabochon (tentative)

Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone

Peridot gemstone pendant

Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)

Rough Corundum (likely Sapphire or Common Corundum)

Aluminum oxide (Al2O3)

Sapphire

Corundum (Al₂O₃) with trace elements causing color variations.

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Nephrite Jade

Nephrite

Diamond

Native Carbon (C)

Green Glass (often marketed as 'Obsidian' or 'Green Quartz')

Amorphous Silica (SiO2) with copper or chromium additives

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)

Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Sapphire

Corundum (Al2O3)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Diamond

Diamond (pure carbon; C)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Likely raw mica-bearing metamorphic rock or mineral fragment

Tentatively biotite schist; visually similar dark mica-rich material

Gemstone-set ring, likely cubic zirconia or diamond

Likely synthetic cubic zirconia (zirconium dioxide, ZrO₂); stones may alternatively be diamond (carbon, C)

Ruby

Corundum (Al2O3)

Cubic Zirconia (CZ)

Cubic Zirconium Dioxide (ZrO2)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Pink Cubic Zirconia (CZ)

Zirconium Dioxide (ZrO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Diamond (faceted)

Diamond (Pure Carbon, C)

Synthetic Zinc/Polycarbonate Composite (Bey-specimen)

Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Colorless faceted gemstone, likely synthetic cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂); natural diamond is a less likely alternative

Clear faceted quartz-like gemstone

Probably rock crystal quartz (SiO₂), though the image may show synthetic glass or cubic zirconia

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Amethyst

Amethyst (SiO2 - Silicon Dioxide with iron impurities)

N/A - Non-Geological Item

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Pumice

Pumice (volcanic rock)

Opal

Hydrous silicon dioxide (SiO2·nH2O)

Bismuth

Bismuth (Bi)

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)