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Chemical formula
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Ca 2 (Mg,Fe,Al) 5 (Al,Si) 8 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 | Almeria, Spain |
| Size | 2.0-3.0cm |
Hornblende massive in andesite.
The term hornblende is the informal name with which the minerals of the "group of amphiboles" that have a color between black and dark-green have traditionally been called.
It is usually found associated with igneous and metamorphic rocks.
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.