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Lovely, rare Andesine

A really rare gemstone is the Andesine. This one have the natural Andesine colour and characteristic luster. (Gemmological determined GF.)

 

Size: 11,9x9,9x5,6 mm

Clarity: --

Origin: Kongo, Earth mined

In stock:  1

 

Price:  USD 24.55

Andesine is a silicate mineral, a member of the plagioclase feldspar solid solution series. The plagioclase feldspars are a continuous solid solution series and as such the accurate identification of individual members requires detailed optical study, chemical analysis or density measurements. Andesine was first described in 1841 for an occurrence in the Marmato mine in Colombia. The name is for the Andes due to its abundance in the andesite lavas in those mountains. In the early 2000s, red and green gemstones began to be marketed under the name of 'Andesine'. After some controversy, these gemstones were subsequently discovered to have been artificially coloured. Andesine occurs in intermediate igneous rocks such as diorite, syenite and andesite. It also occurs as detrital grains in sedimentary rocks.


CLARITY CLASSIFICATION
IF Internally Flawless No Inclusions Visible Even With 10x Magnification.
VVS Very-Very Slightly Included Minute Inclusions Not Visible To Eye.
VSI Very Slight Inclusions Slight Inclusions Visible To Eye.
SI 1-2 Slight Inclusions: Some Inclusions Visible.
I 1-3 Included Many Inclusions Visible. 807163324

 

 

 

 

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Latest update: 28 augusti 2015