Search Mineralpedia – A Mineral Photo Database and Identification Guide
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
This is a one locality mineral, a member of the Labuntsovite supergroup. All members of this supergroup are titanium bearing with niobium to some degree. All are cyclosilicates, reflective of their prismatic habit. This particular specimen contains a tiny less than 1mm cluster of three or four yellowish crystals.