Non Geological

Quartz

Silicon Dioxide (SiO2)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Ruby (set in a gold pendant)

Ruby (Variety of Corundum, Al2O3)

Quartz (River Pebble)

Quartz (Silicon Dioxide, SiO2)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (Fe2O3 · nH2O)

Chert (Flint)

Chert (microcrystalline quartz)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Onyx (beads)

SiO2 (Cryptocrystalline Quartz)

Quartz (specifically a water-worn river pebble)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide, SiO2)

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Vesicular Basalt

Aphanitic Mafic Igneous Rock (with Vesicular Texture)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Optical Calcite

Calcite (Calcium Carbonate, CaCO3)

Granite

Granite (Felsic Plutonic Rock)

Dearest Jewelry (Multigemstone)

Combination of Diamond (C), Emerald (Be3Al2Si6O18), Amethyst/Rock Crystal (SiO2), Ruby (Al2O3), Emerald (Be3Al2Si6O18), Sapphire (Al2O3), and Topaz (Al2SiO4(F,OH)2)

Chalcedony (Agate/Quartz variety)

Cryptocrystalline Quartz (SiO2)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Plagioclase Feldspar

NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)

Granite

Granite (Felsic Intrusive Igneous Rock)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Clear Quartz and Rose Quartz variants)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Green Fluorite

Calcium Fluoride (CaF2)

Green Aventurine (Tumbled Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Granite

Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Gold Nugget

Native Gold (Au)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Quartz (Milky Variant)

Quartz (Silicon Dioxide, SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz (Crystal Fragment)

Silicon Dioxide (SiO2)

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Rose Quartz

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