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Please help! Learning Center What is a mineral? Mineral Name:. Locality Name:. Keyword s :. Dravite This page kindly sponsored by Robert M. Dravite Gallery Search Photos of Dravite. Dravite , etc. Brumado, Bahia, Brazil. Dravite Power's Farm, Pierrepont, St. Lawrence Co. Hide all sections Show all sections. This section is currently hidden. Click the show button to view. Colour: Pale brown to dark-brown to brownish-black, also dark-yellow, blue. A very common member of the Tourmaline Group.
The Mg analogue of schorl. The OH analogue of fluor-dravite. Compare oxy-dravite. Green-to-red color change in Cr-bearing dravite is caused by the Usambara effect see tourmaline for details , which is similar to the alexandrite effect. Dravite from Syros, Greece, is the first example of Mg-rich tourmaline with significant admixture of tetrahedral boron beside the dominant triangular-coordination form. Visit gemdat. IMA status:. Nickel-Strunz 10th pending ed. Older variants are listed for historical use only.
Mineralogical Magazine, 85 3 , American Mineralogist, 68, — Web-version American Mineralogist, 95, — doi Crystal System:. Rotation Stop Start. Geological Setting:. Metamorphosed limestones or mafic igneous rocks, rarely in pegmatites or authogenic overgrowths in sedimentary rocks.
Type Locality:. Coronite of Hunt Gouverneurite Mg-Turmalin. German: Coronit Dravit Gouvernerit Gouverneurit. Spanish: Coronita Dravita Gouverneurita. Chromium-bearing Dravite A chrome-rich variety of Dravite. Cr may occupy both Y and Z sites. Member of:.
Associated Minerals Based on Photo Data:. No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care. Reference List:. Manning, P. The Canadian Mineralogist 9: Dunn, P. Mineralogical Magazine: Povondra, P. Acta Univ.