"Soapstone putty kit" Make your own elastic material with this fun kit.

"Fish tail" Selenite = Maria glass = Hildegard von Bingenstein from Nuevo Leon, Mexico.

Cactus Aragonite (rare!) From Chihuahua, Mexico (box of 8, 12 or 24 pieces)

"Mexico mamma, as I always call her affectionately, I had not seen for more than 8 years", and met her in the "Quartzsite desert in January 2020", and she had bought 55 boxes with 12 pieces, 8 pieces or 24 pieces, all , because Judy Hall in the Crystal Gu
Availability: In stock
SKU
9791
  • Buy 3 for €115.00 each and save 15%
Cactus Aragonite (rare!) From Chihuahua, Mexico (box of 8, 12 or 24 pieces) is available to buy in increments of 1

The mineral aragonite is a calcium carbonate CaCO3 with chemical formula. It is an unstable polymorph of calcite, and it is therefore difficult to distinguish from calcite, because most of the properties are equal. By means of a color test, a distinction can be made: with a Feigl solution is aragonite black, whereas calcite remains colorless. Moreover, it is slightly harder than aragonite and calcite can be determined by a scratch test to which mineral is involved. A third distinction method is the habitus: aragonite usually grows in needle-shaped crystals (acicular), while calcite has a leaf-shaped habit. Using powder is the difference rather to unequivocally because aragonite has an orthorhombic structure and not as a trigonal calcite. Aragonite is always formed at a low temperature near the earth's surface. Aragonite is found in geysers, hot springs, caves, as oölieten in shallow seas, shells and pearls. Sites in Europe, Aragon (Spain), Limousis (France), Girgenti (Sicily), Bilin (Bohemia) and Eisenertz (Austria).

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