Crystal No. 4 is now in two pieces - both privately owned. Two more samples have recently been discovered by A. Peretti: A 2.54 ct faceted Painite, which was identified through testing in Bangkok (Thailand) and labeled as Painite No.5, Painite No. 6a, a large rough fragment of 54 cts (dimensions: 18.7x14.3x10.8 mm) - indirectly discovered from the miner's production, not directly from the mining spot - during an expedition in May 2002 to Mogok close to the private, government licensed Ohn-Gaing mine, Sagaing, Mogok district, Myanmar (Fig.D5). A small fragment (0.15 ct) of this rough Painite was obtained from 6a, and labeled Painite No. 6b. (Fig.D6), whereas the mother piece remained with its finder in Mogok. A research project on Painite No. 5 and 6b revealed that the crystal structure of Painite as presented by Moore and Araki (1976) needed to be revised. For details on the gemologial and special testing see Armbruster et al. (2003).

Gemmological data
Optical character: Uniaxial, negative, e=1.789 and o=1.815, Pleochroism: very strong brownish-red to orange-yellow, Density: 4.00 +/- 0.01

A scientific study on Painite 5 and 6b will be published elsewhere and is submitted to:
Armbruster, Th. (1), Dobelin, N. (1), Peretti A. (2), Günther D. (3), Reusser E. (4) and Grobety, B (5) (2003):
The crystal structure of Painite CaZrB[Al9O18], revisited, American Mineralogist, submitted. download article in pdf format

(1) Laboratorium für chemische und mineralogische Kristallographie, University of Bern, Berne, Switzerland
(2) GRS Gemresearch Swisslab LTD., Hirschmattstr. 6, CH-6003 Luzern, Switzerland
(3) Laboratory of Inorganic Chemistry - Elemental and Trace Analysis, Swiss Federal Institute of Technology, Zürich, Switzerland
(4) Institute of Mineralogy and Petrography, Swiss Federal Institute of Technology, Zürich, Switzerland
(5) Department of Geosciences, University of Fribourg, Fribourg, Switzerland

Further references:
Caringbull G.F., Hey M.H., Payne C.J. (1957): Painite, a new mineral from Mogok, Burma. Mineralogical Magazine 31, 420-5.
Harlow, G.E. (2000) The Mogok Stone Tract, Myanmar: Minerals with complex parageneses. In: Proceedings of the 4th conference on "Minerals and Museums", Melbourne, Australia, 75.
Iyer, L.A.N. (1953).The geology and gemstones of the Mogok Stone Tract, Burma. Memoirs of the Geological Survey of India, 82, pp. 100.
Moore, P.B. and Araki, T. (1976) Painite, CaZrB[Al9O18]: Its crystal structure and relation to jeremejevite, B5[[ ]3Al6(OH)3O15], and fluoborite, B3[Mg9(F,OH)9O9]. American Mineralogist, 61, 88-94.
Shigley, J. E., Kampf, A. R., and Rossman, G. R. (1986) New data on Painite. Mineralogical Magazine, 50, 267-270.
Webster, R. (1994) Gems, their sources, descriptions and identification, p.1027, Butterworths. Sevenoaks, UK.