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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.

Named for the Greek words glaukos and kirinos, meaning roughly “gray” or “bluish-gray” and “waxen”, respectively, in reference to the minerals common color and luster. Glaucocerinite is a rare mineral that occurs in Greece, the United States, Germany, France, and Austria, and it occurs as a secondary mineral on museum specimens of a copper-zinc sulfide.

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

Glaucinite is classified as a phyllosilicate in the monoclinic system and is a Mica group member. Interlayer deficient - Dioctahedral. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Formerly considered a "hydromica". Occurs as pellets or globular grains and is the essential ingrediant of "greensands" which originated in shallow, warm seas of low sedimentation rate.