ARAGONITE CRYSTAL CLUSTER 62 CTS [MX1608]
About This Auction |
About This Seller: mineralgemworld |
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| Minimum Bid (USD) | Feedback Rating | 99.43% Positive | |
| Current Bid (USD) | 0.00 | Member Since | 1 Sep 2007 in Australia |
| Bid Increment (USD) | 1.00 |
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| Bids Placed | 0 | ||
| Starting Bid (USD) | 9.99 | ||
| Reserve Price (USD) | none | ||
| Starts | November 18, 2009 8:45 PM | ||
| Ends | November 22, 2009 8:40 PM | Basic Shipping Information | |
| Auction Category | Mineral Specimens | Shipping Cost | 3.00 paid by buyer |
| Auction ID | 86574 | Shipping Insurance (optional) | 7.00 |
Ends in 6 hours 49 minutes |
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| * note for every bid placed in the last 5 minutes the auction end time increases by 60 seconds - refresh page to update | |||
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Description
ARAGONITE CLUSTER SPECIMEN
This is a natural specimen from Morocco showing strong cluster of crystal development.
Weight 62 cts app
Size 35x20 x19 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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