Hornblende
see also: Etymology of Hornblende
The hornblende is a mineral of the family of the calcic Amphibole S. It crystallizes in the system Monoclinique and its chemical formula is. Its name comes from the German horn , horn and blenden , to dazzle.
It has a hardness from 5 to 6, a density from 3,2 to 3,4, and a green, brown color or black.
The hornblende is a common mineral of the magmatic rocks or metamorphic such as Granite, Syénite, Diorite, Gabbro, Basalte, Andésite, Gneiss or Schiste. It is also the principal mineral of the Amphibolite.
There exist various types of hornblendes:
- very common green hornblende.
- brown hornblende or basaltic hornblende or oxyhornblende rich in Fe3+.
- Barkévicite rich in Fe2+, Na and K.
Layer
- in the Calcareous S crystalline lenses of Willberforce and Tory Hill in the Ontario with the Canada
- in the Pegmatite S of the Mount Sokolinaïa in the north of the the Ural in Russia
- Evsly in Finland
- Borough-Saint-Maurice in France
See too
Amphibole
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