Fulgurite
Fulgurite (Lechatelierite-rich variety)
Category
Browse mineral and glass specimens identified by the Rock Identifier community.
Fulgurite
Fulgurite (Lechatelierite-rich variety)
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Blue Goldstone
Aventurine Glass
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Celestite
Celestine (Strontium Sulfate, SrSO4)
Celestite (Celestine)
Strontium sulfate (SrSO4)
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Lepidolite Bracelet
Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2) often in Quartz matrix
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Fluorite with Rhodochrosite
Fluorite (CaF2) and Rhodochrosite (MnCO3)
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Snowflake Obsidian
Spherulitic Obsidian (Amorphous volcanic glass with Phenocrysts of Cristobalite)
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
Snowflake Obsidian
Volcanic Glass (SiO2 + impurities)
Opalite (a synthetic glass)
Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant
Muscovite Schist
Mica Schist (primarily KAl2(AlSi3O10)(OH)2)
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite mica)
Glass
Amorphous Silicon Dioxide (SiO2)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2