Boleite

Boleite It is found in California and Mexico. Luster pearly. streak light green. density 4.95g/3cm. Hardness 3.25 color indigo blue and light blue. fracture uneven. crystal shape isometric. Cleavage perfect. It forms in corroded zone where lead and copper deposits are found. it is used for medical reasons like thyroid and microbic infections. It is not found in Iowa.

http://www.khyberminerals.com/boleite_cumengeite.htm http://www.wolframalpha.com/entities/minerals/boleite/lb/zl/mc/ http://www.realgems.org/list_of_gemstones/boleite.html http://en.wikipedia.org/wiki/Boleite http://www.prcupcc.org/stones/ad/boleite.htm