Metamorphic (Localized) Or Sedimentary

Quartzite Pebble

SiO2 (Silicon Dioxide)

Citrine

Quartz (Silicon Dioxide - SiO2)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Feldspar

Potassium Feldspar (KAlSi3O8)

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Feldspar (Orthoclase/Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Quartzite pebble

Quartzite (SiO2)

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Quartzite River Rock

Quartzite (SiO2)

Soapstone / Steatite

Steatite (primarily Talc, Mg3Si4O10(OH)2)

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Mica Schist

Foliated Metamorphic Rock (Schist)

Pink Quartzite

Quartzite (SiO2)

Rhodonite

Rhodonite (Manganese Silicate), chemical formula: (Mn,Fe,Mg,Ca)SiO3

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Dumortierite Quartz

Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Marble

Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)

Tiger's Eye (Banded)

Pseudomorph of Quartz after Crocidolite (SiO2)

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Silicate mineral)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Black Onyx

Silicon Dioxide (SiO2) with parallel banding

Tiger's Eye (dark/grey variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Amazonite

Microcline (variety Amazonite) - K(AlSi3O8)

Quartzite with Chlorite/Epidote

Metamorphosed Quartzite (SiO2)

Banded Agate

Cryptocrystalline Silica (SiO2)

Moonstone (specifically Rainbow Moonstone / White Labradorite)

White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)

Red Garnet (Almandine-Pyrope series)

Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Labradorite

(Ca, Na)(Al, Si)4O8

Black Sapphire

Corundum (Al2O3 with inclusions of hematite or ilmenite)

Epidote in Quartz (Unakite-like specimen)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Quartz (SiO2)