Mineral, Specifically A Rock Fragment

Orange Calcite

Calcium Carbonate (CaCO3)

Chevron Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Beach Pebble (likely Quartz or Chalcedony)

Silicon Dioxide (SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Impurities

Red Agate

Agate (Cryptocrystalline variety of Quartz, SiO2)

Larimar

Pectolite (NaCa2Si3O8(OH))

Amethyst Quartz (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Ruby

Corundum (Al2O3 with Chromium traces)

Citrine

Citrine (Silicon Dioxide, SiO2)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Citrine

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Chert (often called Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Chert (and/or River Pebble)

Microcrystalline quartz (SiO2)

Labradorite (likely Black Labradorite or Larvikite)

Labradorite (Na,Ca)(Al,Si)4O8. If a rock, it is typically anorthosite, gabbro, or norite, or a variety of syenite called Larvikite if it is specifically from Larvik, Norway.

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Orange Calcite

Calcium Carbonate (CaCO3)

Coal

Bituminous or Anthracite coal (carbon-rich sedimentary rock)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Amber (Burmite)

Fossilized tree resin (Succinite variant)

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

Milky Quartz in Matrix

Silicon Dioxide (SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Rose Quartz

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

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Fluorite

Calcium Fluoride (CaF2)