Synthetic (Man Made Material Mimicking Natural Stone)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Diamond

Carbon (C)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Chert (Flint)

Silicon Dioxide (SiO2)

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

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.

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Blue Sapphire

Corundum (Al2O3)

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Diamond (faceted)

Diamond (Pure Carbon, C)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

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

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Chert (Flint)

Microcrystalline Quartz (SiO2)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Granite

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

Strawberry Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Corundum (Ruby variety)

Aluminium oxide (Al2O3)

Shale with Vein Infillings

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

Ruby

Corundum (Al2O3 with Chromium traces)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Coquina

Bioclastic Limestone

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Zircon

Zirconium Silicate (ZrSiO₄)

Chert (and/or Flint)

Microcrystalline Quartz (SiO2)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Blue Topaz

Topaz [Al2SiO4(F,OH)2]

Rough Diamond

Diamond (Pure Carbon: C)