Topaz

specimen number:
2063129

location:
Dassu, Braldu Valley, Shigar, Gilgit-Baltistan, Pakistan

description:
A loose gem glassy terminated crystal of sherry colored topaz. In great condition all around, even naturally crystallized on the base and not cleaved.

The geology of Dassu in the Braldu and Shigar Valleys of Gilgit-Baltistan, Pakistan, is defined by extreme tectonic collisions between the Indian and Eurasian plates, which drove intense regional metamorphism and the intrusion of volatile-rich granitic magmas. As these melts cooled, hydrothermal fluids concentrated rare elements into complex zoned pegmatites that formed crystal-lined cavities within high-altitude metamorphic rocks. Historically, local prospectors and miners have targeted these remote, vertical cliff faces during brief summer windows to extract world-class mineral specimens. Dassu has consequently gained global renown among collectors for producing some of the finest, most intensely saturated blue aquamarine crystals known, frequently displaying large prismatic habits and exceptional transparency.

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