ES2 Metamorphic Rocks
Dalradian Metamorphic Zones
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Buchan region, staurolite zone (Sample BB-1)

Andalusite-staurolite schist from Boyndie Bay. The bulk composition is marked "y" in the AFM diagram. The texture is strongly poikiloblastic. The left-hand part of the photograph consists of a very spongy andalusite poikiloblast (grey) enveloping biotite, quartz and opaque. On the right is a twinned staurolite crystal packed with tiny quartz inclusions.

Field of view is 3.5 mm across.


DJW - March 1999