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Auracrystalsandgifts

Gibbsite on Fluorite Specimen #2

Gibbsite on Fluorite Specimen #2

$65.00 AUD
$65.00 AUD
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Approx 4cm 

Gibbsite is a mineral that is a form of aluminum hydroxide, with the chemical formula Al(OH)3. It is a key component of bauxite, an aluminum ore, and is also the most common crystalline aluminum oxide found in soils. 
Here are some facts about gibbsite:
    • Structure: Gibbsite is made up of octahedral sheets of aluminium hydroxide stacked on top of each other. Each layer has aluminium cations in the middle, sandwiched between two layers of OH-.Colour: Gibbsite can be white, gray, or greenish in colour. 
    • Hardness: Gibbsite has a hardness of 2.5 to 3.5. 
  • Specific gravity: Gibbsite has a specific gravity of 2.40. 
  • Cleavage/fracture: Gibbsite has perfect (001) cleavage and uneven fracture. 
  • Occurrence: Gibbsite is found in tropical and subtropical regions, and is especially common in bauxite deposits in the Western Hemisphere. It can also be found in temperate regions, and in deeper soil horizons.
  • Formation: Gibbsite is formed when aluminous and alumino-silicate minerals are altered by intense weathering conditions. It can also be formed from boehmite or clay minerals. 

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    Fluorite is a mineral that is made of calcium fluoride (CaF₂) and is a halide mineral: 
    Appearance
    Fluorite can be transparent or translucent and comes in a variety of colours. 
    Crystal structure
    Fluorite crystallises in a cubic system, but can also form octahedra and other more complex isometric forms. 
    Hardness
  • Fluorite has a hardness of 4 on the Mohs scale of mineral hardness. 
    Uses
  • Fluorite is used in many industrial sectors, including glass, cement, ceramics, and metallurgy. It is also sometimes faceted as a gemstone for collectors, but is rarely used in jewelry because of its softness and fragility.
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