ORTHOCLASE
KAlSi₃O₈
Itrongahy, Madagascar

Orthoclase, a member of the feldspar mineral group, is a very common mineral. However, it is very rare to find orthoclase in transparent gem-quality crystals and even rarer to find those crystals with well-formed faces. This specimen ranks as one of the finest known.

Size: 8.1 cm tall

Acquired: 1989 purchase, Hixon Fund.

Disposition: On display in the Systematic Mineralogy exhibit.

Catalog Number: 33681