Limonite (Gozzany Iron)
Limonite (FeO(OH)·nH2O)
mineral
Category
Not A Geological Specimen
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Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
igneous
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Amber
Succinite (specifically for Baltic amber); Complex mixture of organic compounds (C10H16O)
Organic Mineraloid
Moss Agate
Chalcedony (SiO2) with inclusions of hornblende or chlorite
mineral
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Diamond
Carbon (C)
gemstone
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Diamond
Natural Carbon (C)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Cubic Zirconia (in Jewelry)
Zirconium Dioxide (ZrO2)
mineral
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amber
Succinite
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Druzy Quartz on Agate/Chert
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Amber
Organic gemstone (Succinite)
mineral
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
mineral/sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Chert with Epidote and Jasper inclusions
SiO2 (Silicon Dioxide) with Ca2(Al, Fe)3(SiO4)3(OH) inclusions
sedimentary
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Basalt (with possible Serpentinization)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Quartz Geode
Silicon dioxide (SiO2)
mineral
Agate
SiO2
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Jasper with Chalcedony
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt with Olivine Phenocrysts
Aphanitic Mafic Volcanic Rock (Basalt)
igneous