Organic Gemstone (Not A Rock Or Mineral)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Phaneritic Plutonic Igneous Rock (Rich in SiO2)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Diorite (Dalmatian Stone)

Phaneritic Plutonic Diorite

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Amber

Succinite (Resin C10H16O)

Granite

Granite (Felsic intrusive igneous rock)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amber

Succinite (a common variety of fossilized resin)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide - SiO2)

Raw Emerald in Schist Matrix

Beryl (Be3Al2Si6O18) in Mica Schist

Jasper (Imperial Jasper style)

Silicon Dioxide (SiO2) with impurities

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)

Amber

Succinite (specific to Baltic amber), fossilized tree resin

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Unakite

Unakite (Epidotized Granite)

Almandine Garnet in Schist Matrix

Almandine - Fe3Al2(SiO4)3

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Smoky Quartz on Matrix

Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions

Chert / Flint

Silicon Dioxide (SiO₂)

Chert (Iron-Stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Quartz (Quartzite fragment)

Silicon Dioxide (SiO2)

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

Clear Quartz

Silicon Dioxide (SiO2)

Granitic Pegmatite

Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz