aragonite crystal cluster - hand specimen from the Fès-Meknès region of Morocco

$ 7.50

Aragonite - CaCO3

Tazouta Mine, near Tazouta, Sefrou Cercle, Sefrou Province, Fès-Meknès Region, Morocco

Aragonite, a polymorph of calcite, has the same composition as calcite but crystallizes in the orthorhombic system, while calcite forms trigonal crystals.

Aragonite has three habits of crystallization, either forming radiating groups of fine to coarse crystals, as tabular crystals or as pseudohexagonal twins as in these examples. Single crystals are usually tabular plates or long slender needles.The crystals in these clusters are formed by an intergrowth of three individuals twinned on the prism face and are not true hexagonal forms. They radiate from a common center.

The aragonite clusters at this mine are found in a layer of reddish clay and come out as mudballs. Since the area of the mine is dry, the mudballs are taken to a local river and washed. The reddish color is a hematite stain. 

Aragonite was named in 1797 by Abraham Gottlob Werner for the type locality, the village of Molina de Aragón, Spain, and not the province of Aragón, as has been reported in error.

 

 

 

Select a specimen: If there is more than one specimen shown, you can select a particular specimen by telling us what is in the photo with it, a black and silver pen, a black mechanical pencil, a blue and silver pen, or one of those plus some number of coins, or you can let us make the selection.

Making multiple purchases? Click on the "combine shipping" button in the shopping cart. We'll send an invoice with combined shipping. A link in that invoice will bring you back to checkout, no hassle.

Shipping: in a First Class package unless combined with other items. Click > here < for shipping rates. Use back button to return to this page.