|
Chemical formula
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(Na,Ca)(Al,Fe,Li)(Al,Mg,Mn) 6 (BO 3 ) 3 (Si 6 O 18 ).(OH,F) 4 |
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Crystalline system
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trigonal, hexagonal |
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Class
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silicates |
| Origin | Naipa, Mozambique |
| Size |
2.0-3.0cm |
Radial black tourmaline known as rough Fibrous Tourmaline.
Black tourmaline is a mineral found in different forms. It is possible to find it in pegmatites, granites, seams, hydrothermals and micaceous schists. It also occurs in alpine crevasses.
The mineral includes a label with the name and origin and is attached to a cardboard box. 4 cm square.
*The price is per unit (a single cardboard box of the four shown in the photo)
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.