Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral

Yellow Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Granite

Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)

igneous

Granite

Granite (composition of Quartz, Feldspar, and Mica)

igneous

Basalt

Extrusive mafic igneous rock

igneous

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite with Iron Inclusions

Quartzite (primarily SiO2 with Fe2O3 impurities)

metamorphic

Chert (Nodule)

Silicon Dioxide (SiO2)

sedimentary

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

igneous

Quartzite (River Cobble)

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Agate

Agate (Silicon Dioxide, SiO2)

mineral

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

mineral

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

mineral

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)

igneous

Milky Quartz (Stained with Iron)

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Smoky Quartz (SiO2)

mineral

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

mineral

Unakite

Epidotized Granite

metamorphic

Unakite

Unakitized granodiorite / Quartz-Epidote-Feldspar rock

metamorphic

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

Conglomerate with Native Copper

Clastic Sedimentary Rock with Native Copper (Cu)

sedimentary

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

sedimentary

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

metamorphic

Amethyst (specifically Chevron Amethyst or Dream Amethyst)

Silicon Dioxide (SiO2) with iron impurities

mineral

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

metamorphic

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

metamorphic

Ruby in Kyanite

Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)

metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

mineral

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Pearl (as a Biogenic Mineral)

Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3

mineral

Citrine

Silicon Dioxide (SiO2)

mineral

Citrine

Silicon Dioxide (SiO₂)

mineral

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

mineral

Pearl

Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3

mineral

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

metamorphic

Quartz (Milky or Iron-stained)

Quartz (Silicon Dioxide, SiO2)

mineral

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

mixed