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Welo Opal 0.8g IR22

Welo Opal 0.8g IR22

$4.00 USD
$4.00 USD
セール 売り切れ
Opal, 
South Wollo Zone, Amhara Region, Ethiopia
12 mm x 11 mm x 6 mm
0.8 grams


Glimmering Opal mineraloids,
Opal is said to represent amplification, higher hope, and divine purity.

Geological terms:
  • Waxy, translucent to sub-opaque, amorphous Opal Mineraloid.
  • Gorgeous orange, red, yellow, green and blue Opalescense of the Opal.
  • Minor matrix on the surface of the mineraloids.

    Mindat Info:

    About Opal-AG
    Formula:
    SiO2 · nH2O
    Lustre:
    Vitreous, Sub-Vitreous, Greasy
    Name:
    A stands for amorphous and G for gel-like.

    A variety of Opal-A

    A type of Opal consisting of aggregated spheres of amorphous silica, with water filling the gaps in between. Precious Opal and Potch Opal consist of this kind of structure - the difference being in the regularity of the sizes of the spheres and packing.
      ——— Opal-AG: (Amorphous-Gel) (contains closely packed amorphous silica spheres, which at times form a diffraction grating to create precious opal). Since the packing of the spheres is similar to the structure of a gel, the subscript G ("gel-like") has been added (Flörke et al, 1991; Graetsch, 1994).
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      • In most cases, damage will be present from where the specimen was removed from its parent material.

      • Sandy residue may be present.

      • Minor scattered chips to the crystal edges and faces may be present.

      • Any polished material will have minor surface scratches, natural fractures, and vugs.

      • We use the International System of Units (SI), so please Convert your measurements.

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