Organic Mineraloid And Mineral

Cobalt Glass Slug (Cullet)

Man-made Silicate Glass with Cobalt Oxide (CoO)

Black Pearl (Tahitian Type)

Aragonite / Conchiolin composite (CaCO3)

Libyan Desert Glass

Natural Silica Glass (SiO2 with minor iron and titanium)

Tektite (Indochinite)

Tektite - High-silica amorphous glass (SiO2 + Al2O3)

Amber

Succinates (C10H16O)

Black Opal

Hydrated Silica (SiO2·nH2O)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Tektite (Indochinite)

Tektite (High-silica impact glass)

Leland Blue Stone

Anthropogenic Iron Smelting Slag

Precious Opal

Hydrated Silica (SiO2·nH2O)

Blue Opal Inlay (Simulated/Lab-created)

Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)

Chert (Common Opal/Agate inclusion)

Microcrystalline Quartz (SiO2)

Schist

N/A (a rock type, not a mineral formula)

Obsidian

Obsidian (Extrusive Volcanic Glass)

Snowflake Obsidian

Volcanic Glass with Spherulite inclusions (Chemical composition: 70–75% SiO2 + MgO, Fe3O4)

Sandstone (with Lichen)

Arenite (primarily SiO2)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Green Aventurine

Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Blue Calcite

Calcium Carbonate (CaCO3)

Mahogany Obsidian Arrowhead

Volcanic Glass with Hematite/Magnetite inclusions (Amorphous Silicon Dioxide)

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Marble (Carrara Marble style)

Recrystallized Calcite (CaCO3)

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Chert

Chert (Microcrystalline Quartz, SiO2)

Gold-Bearing Quartz

Silicon Dioxide with Native Gold (SiO2 + Au)

Green Calcite

Calcium Carbonate (CaCO3)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Glass Nugget (Tumbled Glass)

Amorphous Silicon Dioxide (SiO2) with additives

Quartz-bearing Ore (likely Gold-bearing Quartz)

Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Magnetite

Magnetite (Fe3O4)

Gold Nugget / Gold-bearing Quartz

Native Gold (Au)

Chert

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Gold in Quartz Matrix

Native Gold (Au) in Quartz (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Gold Quartz (Auriferous Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides