Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Category
Igneous Or Sedimentary (Anthropogenic Modification)
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Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Milky Quartz
Quartz (Silica / Silicon Dioxide, SiO2)
mineral
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Chalcedony (SiO2) - Cryptocrystalline Quartz
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron (III) Oxide (Fe2O3)
mineral
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Quartz
Silicon Dioxide (SiO₂)
Mineral
Pearl
Pearl; primarily aragonite (CaCO₃) in nacre
gemstone
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Banded Gneiss
Gneiss
metamorphic
Gneiss (Metamorphic Pebble)
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Quartz (with Sandstone/Quartzite rocks)
Silicon Dioxide (SiO2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Greenschist
Chlorite Schist
metamorphic
Milky Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Schist
Mica Schist (Variable chemistry, often rich in muscovite and biotite)
metamorphic