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Chemical formula
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(Fe 2+ ,Mg,Zn) 2 Al 9 (Si,Al) 4 O 22 OH 2 |
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Crystalline system
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monoclinic |
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Class
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silicates |
| Origin | Fanzeres, Portugal |
| Size | 2.00-3.00cm |
Brown Staurolite crystals.
A special property of staurolite is that it is sometimes crystallized symmetrically, it can present a penetrative twin forming angles of 60° and 90°. Macroscopic crystals have a prismatic shape.
It is a highly coveted specimen by collectors for its beautiful twins. This crystal is also used to carve pieces that are very attractive to the eye.
The mineral includes a label with the name and 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 minerals 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.