It is 16 % allotriomorphic ferrite (with Widmanstatten plates) along prior austenite boundaries, and the remainder is Widmanstatten ferrite (finer plates), with ~40 % of what appears to be pearlite.
The top (final bead) is composed of Widmanstatten ferrite (with local allotriomorphic ferrite).
It is 9 % allotriomorphic ferrite (with some Widmanstatten side plates) along prior austenite boundaries, which are more equiaxed.
Fraser, "Crystallographic and morphological relationships between S phase and the Widmanstatten and
allotriomorphic a phase at special S grain boundaries in an [alpha]/[beta] titanium alloy," Acta Materialia, vol.
Jijal ultramafic rocks are medium to coarse grained and have hypidiomorphic texture whereas chromite mostly has
allotriomorphic texture.
The texture is medium to coarse-grained hypidiomorphic or
allotriomorphic (2-10 mm crystal size).
Less visible is the shape preferred orientation of quartz and feldspar, which is mainly caused by an
allotriomorphic habitus (in the case of quartz), and alteration (sericitisation of feldspars).
hypidiomorphic equigranular 2 Belmont Tonalite m.g.,
allotriomorphic to hypidiomorphic equigranular; locally inequigranular 3 Carrying Cove m.g.
Most rocks under the microscope are medium-grained hypidiomorphic to
allotriomorphic subequigranular and composed of plagioclase hornblendic amphibole opaque iron oxide quartz and in some biotite titanite and rare perthite.
Most of them correspond to coarse-grained diorite and gabbro with phaneritic
allotriomorphic texture (Fig.
