Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Category
Mineraloid (Man Made Origin)
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Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Citrine-tinted)
Silicon Dioxide (SiO2)
mineral
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Caribbean Calcite
Calcite and Aragonite (CaCO3)
mineral
Emerald (Faceted Gemstone)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Diamond (Green tinted)
Carbon (C) with trace impurities or lattice defects
mineral
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
Igneous
Fluorite Tower
Calcium Fluoride (CaF2)
mineral
Fluorite (Rainbow Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
K2 Jasper (K2 Granite)
Azurite-in-Granite
igneous
Larimar and Fossil Coral
Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone
mineral and sedimentary
Diamond (in a jewelry setting)
Carbon (C)
mineral
Raw Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Red Aventurine
SiO2 (Silicon Dioxide with Hematite/Goethite inclusions)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Coprolite
Coprolite (fossilized feces)
sedimentary
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Orbicular Jasper (Eye Jasper / Kambaba-like pattern)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Fluorite (Green Fluorite)
Calcium Fluoride (CaF2)
mineral
Granite
Granite (Alkali-feldspar granite)
igneous
Diamond
Diamond (Pure Carbon, C)
mineral
Pink Granite
Felsic Intrusive Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
Igneous