Metamorphic Rock (Primarily Composed Of Minerals)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Igneous Rock)

Pyrite

Pyrite (FeS2)

Grey Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Quartz in Basalt (Xenocryst)

Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock

Basalt with Quartz Veining

Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Sandstone

Arenite (primarily SiO2)

Silver (Native Element)

Ag (Native Silver), with minor Copper (Cu)

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Blue Sapphire

Corundum (Al2O3)

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Agate (with possible Chalcedony layers)

Silicon dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Citrine

SiO2 (Silicon Dioxide)

Vesicular Basalt with Amygdules

Amygdaloidal Basalt

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2

Quartzite

Quartzite (SiO2)

Lapis Lazuli

Lapis Lazuli (Aggregate primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,SO4,Cl,1-2) with Calcite and Pyrite)

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Shattuckite (Blue Quartz/Jasper Matrix)

Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)

Zoisite with Ruby

Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)

Amazonite

Microcline (KAlSi3O8) with lead impurities

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite with Iron Oxide matrix

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Nickel

Nickel (Ni)

Sunstone

Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Blue Sapphire (in a faceted jewelry setting)

Corundum (Al2O3) with trace Iron and Titanium

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)