Mineral Based Human Made Alloy

Chert (and Flint)

Silicon Dioxide (SiO2)

Sandstone Pebble

Arenite (SiO2 based)

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Chert (or Limestone)

Sedimentary Cryptocrystalline Quartz (SiO2) or Calcium Carbonate (CaCO3)

Iron Meteorite

Siderite (comprised primarily of Kamacite and Taenite alloys)

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Orange Crackle Quartz

Silicon Dioxide (SiO2) with thermal fracturing

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Sandstone

Arenite (composed primarily of SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Aquamarine

Beryl (Be3Al2Si6O18)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Apatite

Calcium Fluorophosphate - Ca5(PO4)3F

Chert / Flint

Silicon Dioxide (SiO2)

Opalite

Synthetic Opalite Glass / Opalized Glass

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Chert (Flint / Jasper variant)

Microcrystalline Quartz (SiO2)

Black Chert River Stone

Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Cryptocrystalline Quartz (SiO2)

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)

Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Geode (Unopened)

Quartz/Chalcedony concretion

Sandstone

Arenite (specifically Iron-stained Quartz Sandstone)

Marble

Metamorphosed Limestone (principally CaCO3)

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Desert Rose (Barite Rose / Gypsum Rose)

Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4%22H2O)

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Herkimer Diamond

Quartz (Silicon Dioxide - SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)