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3949
7

ARAGONITE CRYSTAL CLUSTER 74 CTS [MX1615]

SKU
寸法(mm)
x x mm
重さ (CT)
タイプ
Specimen

ARAGONITE CLUSTER SPECIMEN 

This is a natural specimen from Morocco showing strong  cluster of crystal development.

Weight  74 cts app

Size  34x 25x22  mm app

Aragonite occurs in two distinct places Spain and Morocco. This crystal cluster is from a pocket in a Moroccan lava bed, where it formed at high pressure and relatively low temperature. At surface conditions, aragonite is actually metastable, and heating it to 400°C will make it revert to calcite. The other point of interest about these crystals is that they are multiple twins that make these pseudo-hexagons. Single aragonite crystals are shaped more like tablets or prisms.

Aragonite is calcium carbonate  with the same chemical formula as calcite, but its carbonate ions are packed differently. That is, aragonite and calcite are polymorphs of calcium carbonate. It is harder than calcite (3.5 to 4, rather than 3, on the Mohs scale) and somewhat denser, but like calcite it responds to weak acid by vigorous bubbling. You may pronounce it a-RAG-onite or AR-agonite, though the majority of American geologists use the first pronunciation. It is named for Aragon, in Spain, where notable crystals occur.

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  • royrock
    royrock
    ポジティブ

    Beautiful agate piece , and as always fast efficient service from Sedagems

  • maiziemaizie
    maiziemaizie
    ポジティブ

    Gorgeous stones, very happy

  • maiziemaizie
    maiziemaizie
    ポジティブ

    Gorgeous stone, very happy

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配送:
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発送元:
Australia

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この出品者は、Australia での取引に 10.00% 税金を追加します。

概要

リストタイプ : Standard
製品番号 : 86581
始まります : 21st November 2024 08:00 pm PST
* すべての価格は:通貨で表示されます