Mineral (Silicate Variety)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Barite

Barium Sulfate (BaSO4)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite

Serpentinite

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is cryptocrystalline quartz). Chemical Formula: SiO2 with inclusions of crocidolite fibers.

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with various inclusions

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Banded Rhyolite (likely Green Jasper/Agate variety)

Silicon Dioxide (SiO2) with mineral inclusions

Rose Quartz

Rose Quartz (SiO₂)

Chert (Flint nodule)

Silicon dioxide (SiO2)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Serpentinite

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

Amphibolite

Amphibolite

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Blue Chalcedony

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Garnet (likely Almandine or Pyrope)

Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)

Milky Quartz

Quartz (SiO₂)

Chert (Nodule)

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl)

Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)

Chert (and Flint variant)

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusion of Mica

Aventurine (Green)

Silicon Dioxide (Quartz variety) containing Fuchsite - SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Botryoidal Chalcedony with Calcite

Chalcedony (SiO2 with accessory minerals, likely CaCO3)

Banded Agate (specifically Moss or River Agate variety)

Cryptocrystalline Quartz (SiO2)