mineral and glass
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
Pearl: Hardness 2.5-4.5, white/cream color, pearly luster, amorphous/organic. Glass: Hardness 5-6, deep red, vitreous luster, amorphous structure.
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Physical properties
Pearl: Hardness 2.5-4.5, white/cream color, pearly luster, amorphous/organic. Glass: Hardness 5-6, deep red, vitreous luster, amorphous structure.
Formation & geological history
Pearls are organic gems formed inside mollusks over 1-3 years. The red material appears to be synthetic glass or garnet-colored resin mimicking metamorphic minerals.
Uses & applications
Primary use is in fashion jewelry and personal adornment.
Geological facts
Pearls are the only gemstones made by living creatures. Red glass has been used since ancient times to imitate expensive rubies and garnets.
Field identification & locations
Identify pearls by the 'tooth test' (gritty texture on teeth). Identify glass by looking for round bubbles or lack of natural inclusions under magnification and its warmth to the touch compared to stone.
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Other mineral and glass specimens
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
mineral (synthetic glass)
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral