Mineral

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Dinosaur Bone (Fossilized)

Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)

Granite

Phaneritic Felsic Igneous Rock (Main minerals: SiO2, KAlSi3O8, NaAlSi3O8)

Schist

Crystalline Metamorphic Rock (Schistose)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Fluorite

Calcium Fluoride (CaF2)

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)

Granite Cobble

Granite

Green Aventurine

Quartz with Fuchsine inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Chrysocolla

Chrysocolla, (Cu, Al)2H2Si2O5(OH)4·nH2O

Granite

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)

Aquamarine

Beryl (Be3Al2Si6O18)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Citrine Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)

Amethyst (Polished/Carved Crystal)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Varietal of Quartz), SiO2 with traces of Iron (Fe3+)

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Amethyst (Quartz)

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Ferruginous Quartz

Quartz (Silicon Dioxide) with Iron Inclusion, SiO2

Gold-bearing Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)