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3218
4

ARAGONITE CRYSTAL CLUSTER 55.5 CTS [MX1613]

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Dimensions (mm)
x x mm
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ARAGONITE CLUSTER SPECIMEN 

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

Weight 55.5  cts app

Size  35x23 x14  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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Rest of the world
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Registered Shipping $9.00 / 7 days $16.00 / 21 days
Australia
Registered Shipping is discounted to $9.00 on orders with 2 or more items
Rest of the world
Registered Shipping is discounted to $16.00 on orders with 2 or more items

sedagems
sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
Mermaid Waters, Australia
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  • gemarab
    gemarab
    Positive

    Great and clear sapphire, beautiful cut ! Great packaging

  • js20031
    js20031
    Positive

    AAAA+++ Very Happy! Just like the pic.

  • js20031
    js20031
    Positive

    AAAA+++ Very Happy! Just like the pic.

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Shipping Details

Shipping:
$16.00 21 days via Registered Shipping
Ships from:
Australia

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Overview

Listing Type : Standard
Product ID : 86579
Starts : 7th November 2024 08:00 pm PST
* All prices are in USD