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Trenutna ponuda
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Ponude
Zatvoreno
20/01/2022 05:14 am

26mm 22ct Hemimorphite cabochon

1 bid
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18 gledanja
pojedinosti
SKU
Dimenzije (mm)
26 x 18 x 5mm
Težina (cts)
22
Boje
Opis

ShangrilaGems

‘The Best Gems on the Web!’

Gem-A Corporate Member

We managed to find some of this rare gemstone on our last buying trip and we couldn’t quite believe our luck. Grab it as we wont get it again!

Hemimorphite is a rare gem quality form of zinc silicate. Hemimorphite is very closely associated with Smithsonite, another rare collector’s gem. For many years, hemimorphite and smithsonite were both classed together another gemstone called calamine because of the similarity. In 1803 it was discovered to be two different minerals by mineralogist, James Smithson (of the Smithsonian Institute).
Hemimorphite is a zinc silicate, whilst smithsonite is a zinc carbonate; zinc silicate Hemimorphite is considered to be rarer than Smithsonite. . The name ‘hemimorphite’ originates from the Greek words ‘hemi’ and ‘morph’, which respectively translate as ‘half-shape’. The name refers to its unusual hemimorphic crystal form, which means that the axial ends of crystals are asymmetrical. One end of each crystal is rather blunt, dominated by a pedion (a single face), while the other is pointed and pyramidal.
Hemimorphite can be identified by its distinct composition and unique crystal structure. Hemimorphite can be composed of over fifty percent zinc. Gemmologically, it has a refractive index of 1.614 to 1.636 and a density or specific gravity of 3.30 to 3.50. Its hardness is 5 on the Mohs scale.
Few deposits of Hemimorphite yield gemstone quality materials. Some of the most significant deposits are from Vieille Montagne, Belgium and Aachen, Germany, Mexico, Russia (Siberia), The Congo, Namibia, Madagascar and the United States, including Pennsylvania, Montana, Colorado and New Mexico.
Hemimorphite can occur in various tones of blue, green and colorless. Most gemstones are blue to blue-green, and look similar to chrysocolla or turquoise. The most desirable color is sky to Swiss blue, which is reminiscent of Paraiba tourmaline. Hemimorphite often exhibits bands of blue with white streaks, and it may also be found interspersed by a dark matrix. Gem quality hemimorphite typically ranges from transparent to translucent in clarity. There is no known treatment for this gemstone - it is natural and organic.

Chemical Formula: Zn4Si2O7(OH)2•H2O - Hydrous basic zinc silicate
Crystal Structure: Orthorhombic; tabular
Color
Blue green, colorless
Hardness
5 on the Mohs scale
Refractive Index:
1 614 to 1.636
Density
3 30 to 3.50
Cleavage
Perfect
Transparency Transparent to opaque
Double Refraction +0.022
Luster Vitreous, adamantine

Fluorescence: Weak

dostava
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26mm 22ct Hemimorphite cabochon
Kent, Ujedinjeno Kraljevstvo Velike Britanije i Sjeverne Irske
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Nedavne povratne informacije
  • 4susan4
    4susan4
    Pozitivan

    Paid and shipped - no feedback left after 100 days

  • dbredwood
    dbredwood
    Pozitivan

    Communication was excellent every detail was clearly explained, and responses were quick and friendly. Highly Recommend!

  • sscannonball
    sscannonball
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    Beautiful stone, very happy with purchase

  • veronicamtoub
    veronicamtoub
    Pozitivan

    Paid and shipped - no feedback left after 100 days

  • veronicamtoub
    veronicamtoub
    Pozitivan

    Paid and shipped - no feedback left after 100 days

Povijest ponuda (1)
4susan4
4susan4
prije 3 godine
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Detalji dostave

Troškovi:
Tranzit:
14 days putem Registered Shipping
Brodovi iz:
Ujedinjeno Kraljevstvo Velike Britanije i Sjeverne Irske

Načini plačanja

  • paypal

Pregled

Vrsta unosa : Standard
Identifikacijski broj proizvoda : 637595
Početna ponuda :
Počinje : 19th January 2022 03:15 pm PST
Završava : 20th January 2022 05:14 am PST
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