I received boulder opal pendants yesterday. very happy with my purchase. Will buy from this seller again. Kisumu
|Dimensions (mm)||16 x 15 x 9mm|
|Weight (carats)||43.55 carats|
ARAGONITE CLUSTER SPECIMEN
This is a natural specimen from Spain showing strong cluster of crystal development.
Weight 43.55 cts app
Size 16 x 15 x 9 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.
The colors in the image are different from the actual piece since in reality it’s not that smoky. The worst part is, the back with the pyrite seems to have less pyrite there than what was presented in the image. It’s crumbled but there were no pieces in i
so sorry to hear , could you return for a refund?
The luster doesn’t look exactly the same and the color appears a tad darker but it’s the same stone and accurate based on the selling page. Still a really good buy and well packaged
|Starts||20th May 2018 9:45pm PDT|
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