$51.00 AUD
价格
3987
1

159 Grams PARCEL FIVE ARGONITE CLUSTERS GG 2088

存货单位
尺寸(毫米)
30.000 x 20.000 x 20.000mm
重量 (cts)
159.000
颜色

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

Size av  30c 20x 20    mm app

images are exact items you wiil receive

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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概述

列表类型 : Standard
产品编号 : 3103
开始 : 12th November 2024 12:50 pm AEST
* 所有价格均以:货币为单位