Mineral And Metamorphic Rock

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Basalt with Calcite Veins

Aphanitic mafic volcanic rock with CaCO3 inclusions

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

River Rock (likely Quartzite or Quartz-rich Siltstone)

Quartzite (SiO2)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Smoky Quartz

Silicon Dioxide (SiO2)

Aquamarine (Beryl)

Beryllium aluminum silicate (Be3Al2Si6O18)

Cloudy Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Tanzanite

Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Corundum (Sapphire/Ruby in Matrix)

Corundum (Al2O3)

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Fuchsite

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

Rhodonite

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

Rhodonite

Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3

Citrine

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide)

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Citrine Quartz

SiO2 (Silicon Dioxide with Iron impurities)

Smoky Quartz (Faceted Beads)

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Quartz Vein Rock

Quartz (Silicon Dioxide, SiO2)

Bauxite

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

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Glauconitic Sandstone (Greensand)

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

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Garnet (likely Almandine or Pyrope)

Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)