Crystal

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Septarian Nodule (Yellow Calcite in Limestone)

Septarian Concretion (CaCO3 with Aragonite and Calcite)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Herkimer Diamond variant)

Silicon Dioxide (SiO2)

Dyed Chalcedony (Agate)

Silicon Dioxide (SiO2) with artificial pigment

Orange Quartz

Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Porphyritic Basalt

Porphyritic Fine-grained Mafic Volcanic Rock

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Rose Quartz

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

Quartz Geode

Silicon Dioxide (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Fancy Jasper

Silicon dioxide (SiO2)

Pink Quartz (Rose Quartz variant)

Silicon Dioxide (SiO2)

Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite mica)

Calcite (Banded Calcite / Onyx Marble)

Calcium Carbonate (CaCO3)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Tiger's Eye (Rough)

SiO2 (Silicon Dioxide / Pseudomorph of Quartz after Crocidolite)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Pyrite

Iron Disulfide (FeS2)

Banded Calcite (often sold as Onyx Marble)

Calcium Carbonate (CaCO3)

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

Septarian Nodule (Dragon Stone)

Septarian concretion (Complex of Calcite, Aragonite, and Limestone/Clay)

Basalt with Peridotite (Olivine) Xenolith

Olivine-rich Peridotite (Dunite) xenolith in Vesicular Basalt; chemical formula (Mg,Fe)2SiO4

Quartz on Host Rock

Silicon Dioxide (SiO2)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Clear Quartz

Silicon Dioxide (SiO2)

Dyed Imperial Jasper (Sea Sediment Jasper)

Silicon Dioxide (SiO2) - Impure Quartz/Chalcedony

Granitic Pegmatite

Pegmatite (composed primarily of Quartz, Feldspar, and Muscovite mica)

Pyrite (Fools Gold)

Iron Sulfide (FeS2)

Granite

Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)

Pyrite

Iron Sulfide (FeS2)

Granite

Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)