Metamorphic Rock (Primarily Composed Of Minerals)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Quartzite with Quartz Geode / Vug

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Coquina

Bioclastic Limestone

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Granite

Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)

Jade

Jadeite or Nephrite (both are commonly referred to as 'jade'). Jadeite: NaAlSi2O6; Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2.

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and K-feldspar)

Milky Quartz (with Iron Oxide staining)

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (primarily SiO2)

Citrine

Crystalline Quartz (SiO2) with iron impurities

Milk Quartz (White) and Yellow Aventurine (Yellow)

Silicon Dioxide (SiO2)

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Garnet Schist

Almandine-Mica Schist

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Orca Agate (Blue Chalcedony)

Silicon Dioxide (SiO2)

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Quartzite

Quartzite (SiO2)

Granite

Granite

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Rainbow Moonstone with Black Tourmaline

White Labradorite with Schorl (Na,Ca)(Al,Si)4O8

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Magnetite / Ironstone

Magnetite (Fe3O4)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Orange Calcite

Calcium Carbonate (CaCO3)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Pyrite

Iron Sulfide (FeS2)

Epidote

Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Quartzite

Quartzite (SiO2)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)