Geology Reference
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Fig. 6.4 Artificial twinning
of calcite parallel to plane
ð 0112 Þ produced by forcing a
knife-edge into a cleavage
rhomb at point a (derived
from the sketch in Fig. 516,
p. 210, from Dana 1932 )
α
Fig. 6.5 Section of strain
ellipsoid for mechanical
twinning. Section is normal to
intermediate principal strain
axis, a direction of no strain.
The plane of the drawing is
known as the ''shear plane''.
K 1 and K 2 are the circular
sections or planes of no
distortion
h 1
g
a
K 2
K 1
h 2
 
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