This website uses cookies so that we can provide you with the best user experience possible. Cookie information is stored in your browser and performs functions such as recognising you when you return to our website and helping our team to understand which sections of the website you find most interesting and useful.
Sanidine
Feldspar group
Formule chimique :
(K,Na)AlSi3O8
Système cristallin :
Monoclinic
Etymologie :
from the Greek word sanidion, which means tablet due to the tablet-like shape of sanidine crystals
Dureté :
6
Densité :
2.6
Propriétés physiques :
the luster is vitreous, the colour ranges from white to grey. Translucent to transparent, conchoidal to uneven fracture, good cleavage according to (001)
Propriétés chimiques :
only attacked by hydrofluoric acid.
Formule chimique :
(K,Na)AlSi3O8
Habitus :
often flattened tablet according to (010) or elongated according to (100). Frequent macing (abutment or interpenetration (Carlsbad macing)).
Gîtologie :
Sanidine is a potassium feldspar always associated with magmatic rocks of the alkaline series as for example in rhyolites, trachytes and trachy-andesite.
Determination :
not easy to determine except when macles are clearly visible.
Utilisation :
No major use recognised
Sanidine is a common mineral in the world from the moment alkaline volcanic rocks are found. Many countries have it. In France, sanidine is identified in the Puy-de-Dôme and in the Monts Dore where sanidines often present very beautiful Carlsbad macles (macle by interpenetration of two crystals)
(No Ratings Yet)
Loading...
Leave a Reply