Aragonite (specifically Mexican Marbled Onyx)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Category
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Aquamarine
Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety
Mineral
Copper Ore
Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)
mineral
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Hematite
Hematite (Fe2O3)
Mineral
Amethyst (Rough Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Silicon dioxide / Violet Quartz (SiO2)
mineral
Amethyst
Silicon dioxide / Quartz (SiO2+Fe4+)
mineral
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Moonstone (Orthoclase Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)
mineral
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Mineral Simulant (Synthetic Glass)
Obsidian
Obsidian (Volcanic Glass)
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
metamorphic
Earthy Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dragon Vein Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Himalayan Salt (Halite)
Halite (NaCl) with trace minerals
mineral
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Breciated Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Jasper (Willow Creek/Desert style)
Silicon Dioxide (SiO2) with iron and clay impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Rhodonite
Rhodonite (MnSiO3)
Mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)