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Mineralpedia Details for Giuseppettite

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Giuseppettite

Giuseppettite

Named after Giuseppe Giuseppetti, a Professor of Mineralogy at the University of Pavia in Italy. Giuseppettite is a rare mineral that occurs only in Italy and Norway, and possibly in the United States. It can be found in veinlets in sanidine-rich volcanic ejecta. Associated minerals include K Feldspar, nephelie, hauyne, biotite and kalsilite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/giuseppettite.pdf

Formula
Na42K16Ca6Si48Al48O192(SO4)10Cl2ยท5H2
Crystal System
Trigonal 
Crystal Habit
Anhedral Grains 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
light violet blue 
Streak
white 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
6-7 
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Giuseppettite from Sacrofano, Roma, Lazio, Italy

Giuseppettite
            from Sacrofano, Roma, Lazio, Italy Light bluish-purple crystalline Giuseppettite to 6mm.
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