Mineral (Primary Constituent)

Bicolor Quartz Pebble

Silicon Dioxide (SiO2) with mineral inclusions

Labradorite

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

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Lapis Lazuli

Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Desert Rose (Baryte or Selenite)

Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4·2H2O)

Blue Calcite

Calcium Carbonate (CaCO3)

White Opal

Hydrated Silica (SiO2·nH2O)

Graphic Granite

Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)

Pink Garnet in Matrix

Grossular or Almandine Garnet (X3Y2(SiO4)3)

Septarian (Dragon Stone)

Septarian concretion (Calcite, Aragonite, and Limestone)

Labradorite

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

Emerald (Rough)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Andesite Porphyry (Geological Drill Core)

Andesite Porphyry

Ironstone Concretion

Siderite or Hematite Concretion

Botryoidal Chalcedony (Agate/Chert Nodule)

Chalcedony (SiO2)

Amethyst

Amethyst (variety of Quartz, SiO2)

Septarian Nodule (Septarian Dragon Stone)

Septarian concretion (composition: Calcite CaCO3, Aragonite CaCO3, and Limestone/Clay)

Epidote in Quartz (Unakite-like specimen)

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

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Botryoidal Goethite on Quartz

Goethite (α-Fe3+O(OH)) on Quartz (SiO2)

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)

Rhodonite

Rhodonite (Mn,Fe,Mg,Ca)SiO3

Emerald In Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Amethyst

Amethyst (SiO2 with Iron impurities)

Amethyst

Amethyst (Quartz variety), Silicon Dioxide (SiO2)

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation

Sodalite Syenite

Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Carnelian

Carnelian (Silicon Dioxide: SiO2)

Amazonite

K(AlSi3O8) - Microcline (Lead-bearing variety)

Fuchsite

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)