Dravite

Specimen ID: MPQ-7DK

Mineral(s)
Dravite : NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Locality
As recorded:
Pyant Gyi mine, Pein-Pyit, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar
Mindat locality:
Events

Photo added to mindat.org

The splitted rose-like dipyramidal and smaller prismatic double-terminated crystals of light-green, coloured by very minor vanadium admixture, Dravite. Usually similar tourmalines from the locality were labeled as Uvites, but this is wrong. As visible from microprobe test (see the daughter photo) Ca content in the mineral is quite negligible. FOV is 2x2 cm. Specimen was obtained from Sieghard Ellenberger (Crystal-Treasure). Pavel M. Kartashov analytical data, collection and photo.
Pavel Kartashov - 7th January 2011

Photo added to mindat.org

Back sides of the same crystals of Uvite. We can see that opposite side of the splitted dipyramidal crystal has very simple three-face head. Usually similar tourmalines from the locality were labeled as Uvites, but this is wrong. As visible from microprobe test (see the daughter photo) Ca content in the mineral is quite negligible. FOV is 2x2 cm. Specimen was obtained from Sieghard Ellenberger (Crystal-Treasure). Pavel M. Kartashov analytical data, collection and photo.
Pavel Kartashov - 7th January 2011

Photo added to mindat.org

Analytical data for the Dravite from Pyan Gyi mine. We can see, that mineral contain only traces of vanadium (below analytical error limit, but its peaks on the spectrum still is visible) and completely Cr-free. Besides that, Ca content in it is very subordinate, so Na is absolutely predominate in A site of the tourmaline, i.e. it is Dravite. And this dravite is completely magnesial Fe-free. Specimen was obtained from Sieghard Ellenberger (Crystal-Treasure). Pavel M. Kartashov analytical data, collection and photo.
Pavel Kartashov - 8th January 2011
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Nicolas HEBERT
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