Product excellent, what u see is what you get. Thank you. I hope all is better in Australia. Bless you all downunder!
|Dimensions (mm)||not provided|
|Weight (carats)||not provided|
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.
|Starts||10th Mar 2014 7:30pm PDT|
|Express Shipping||$33.00||5 Days|
|Registered Shipping||$15.00||14 Days|
|Standard Shipping - Untracked||$5.00||28 Days|
|Shipping Insurance all providers $7.00 (optional)|