Munakataite

Munakataite


Composition:

Pb2Cu2(Se4+O3)(SO4)(OH)4

Crystal System : Monoclinic
Colours: Pale-blue, intense-blue
Lustre : Vitreous, pearly
Hardness (H) : 1.5-2.0
Specific Gravity (S.G) : 5.53

 

Distribution

Extremely rare. Questionable status at Tsumeb, pending peer-reviewed publication.

Occurrence

  • Supergene

Paragenetic and General Notes

Munakataite has been identified on a specimen in the collection of Shields Flynn (USA), where it occurs in association with mimetite, quartz, and smithsonite.  The munakataite has been analysed by EDS, XRD, and Raman spectroscopy at the University of Arizona (RRUFF project).  It occurs as sheaves of minute blue needles (resembling connellite, for which it was initially mistaken) associated with galena, mimetite, plumboselite, quartz and smithsonite. (Shields Flynn, personal communication to M.Southwood, October 2015).