|
Chemical formula
|
(Mg 2 Al 2 )Si 8 O 2 0(OH) 2 ·4H 2 O |
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Crystalline system
|
monoclinic |
|
Class
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silicates |
| Origin | Segovia, Spain |
| Size |
2.0-3.0cm |
Rough Palygorskite.
This curious mineral that comes from the alteration of magnesium silicates in soils and sediments, is called "Mountain leather" or "cardboard stone" due to its flexibility, it is a mineral that can be bent and does not break. It is usually found in amorphous sheets.
The mineral includes a label with the name, origin and is attached to a 4 cm square cardboard box.
*The price is per unit (a single cardboard box of the four shown in the image)
Since the minerals are natural, you will receive a piece similar to the one in the photograph. The samples come in cardboard boxes and are glued to a porex base with hot silicone; these can be removed using ethyl alcohol without damaging the mineral. The size is approximate.