The pegmatites of the Shingus-
Bulochi field commonly have peripheral fine-grained granite or alpite margins and coarse-grained central areas with vugs and miarolitic cavities from 5 cm to 1 m across. Transparent pale-blue gem-quality crystals of
beryl, accompanied by euhedral feldspar, quartz, schorl, and mica are found in cavities and may form part of the pegmatite matrix.
In some Bulochi pegmatites, colourless
topaz, green and brown
tourmaline,
goshenite, and
morganite as well as
lepidolite and
spodumene occur sporadically.
Ref: E.Ya. Kievlenko, Geology of gems, 2003, p. 110
Gemstone List