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AXINITE (Fe) CHANGING COLOR. 4.88 cts. SI1. France
N / A

The + of this product

The structure of axinite consists of [Si4O12]8- rings and BO3 units; separate rings, parallel to each other and almost parallel to the (010) plane. These groups are linked by iron in octahedral position, by aluminum in tetrahedral and octahedral coordination, and by calcium which is located in the center of an irregular polyhedron of 10 oxygens.
Properties
The important point in the chemistry of this silicate is the presence of boron in large quantities. The percentage of calcium remains constant; on the other hand, iron and manganese can vary in inverse proportion. The optical properties of axinites are closely related to the content of these three elements.

The expanded forms are {110}, {-110}, {1-11}. The faces are often finely striated and form sharp angles giving the mineral a sharp appearance.
Cleavage is good on {100}.
The color is lilac brown; yellowish for manganese-rich axinites; absent or slight pleochroism.

Paragenesis
Axinite appears as a mineral of contact metamorphism and metasomatosis. It is found in altered calcareous sediments and in altered basic igneous rocks undergoing metamorphism with the introduction of boron. It can be associated with other silicates rich in calcium and boron: tourmaline, datolite, calcic amphiboles, actinolite, zoisite, calcite, as well as quartz. Axinite is found in crystalline shales metamorphosed by granite. It is used as a gemstone

DESCRIPTION

Very nice changing colors.

Important information

Collectible stone.
Unheated stone.

Features

STONE NAME Natural Axinite
AVERAGE WEIGHT 4.88 carats
FORM Oval
DIMENSIONS (mm) 4.88 carats
COLOR Changing color
CLARITY SI1
CHANDELIER Excellent
ORIGIN France
HARDNESS 6.5-7
DENSITY 3.26-3.36
REFRACTIVE INDEX 1.656 - 1.704
TREATMENT Not heated
AMOUNT 1 piece
REFERENCE 2013783A
CERTIFICATE OF AUTHENTICITY Not included
WEIGHT 0 to 100g
Type of product Stones
Maker Other
Style Classic
Audience For all
Ref TMPL_SKU000925

Payment

Return

Right of withdrawal: In accordance with the provisions of articles L. 120-20 and following of the Consumer Code, consumers have a right of withdrawal. Only products returned as a whole, in their complete original packaging and in perfect condition, may be subject to a right of withdrawal. The consumer may choose to request a credit note on the sums paid, the exchange of the product or a refund of the sums paid. In such a case, A BIJOUX must, within THIRTY DAYS of the exercise of the right of withdrawal, credit the consumer with a credit note or refund the sums paid. Returns / Exchanges: - Before any return, please obtain an agreement by email, in order to process the return under the best conditions. - An item can be returned to us within 15 days of its dispatch (postmark being taken) provided that it has not been worn and that it is sent back in its original packaging. - The return postage costs incurred by a return are the responsibility of A Bijoux after the customer's request. - We will exchange the item for another model. - A refund will be possible IN THE FORM OF A CREDIT.

Legal Notice



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Right of withdrawal: In accordance with the provisions of articles L. 120-20 and following of the Consumer Code, consumers have a right of withdrawal. Only products returned as a whole, in their complete original packaging and in perfect condition, may be subject to a right of withdrawal. The consumer may choose to request a credit note on the sums paid, the exchange of the product or a refund of the sums paid. In such a case, A BIJOUX must, within THIRTY DAYS of the exercise of the right of withdrawal, credit the consumer with a credit note or refund the sums paid. Returns / Exchanges: - Before any return, please obtain an agreement by email, in order to process the return under the best conditions. - An item can be returned to us within 15 days of its dispatch (postmark being taken) prov