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A. Elongate phenocryst of plagioclase feldspar with narrow and sharply defined albite twins. The field of view is about 2 x 3.2 mm. Crossed-polar light. DDH 318-246.7
B. Rectangular phenocryst of plagioclase feldspar with narrow and sharply defined albite twins. The field of view is about 1.6 x 2 mm. Crossed-polar light. DDH 303-350.55
C. Phenocryst of plagioclase feldspar with broad and diffuse albite twins. The field of view is about 1.0 x 1.6 mm. Crossed-polar light. DDH 316-314.7
D. Phenocryst of plagioclase feldspar which displays two directions of albite twins that are oriented nearly 90 degrees to each other. The field of view is about 0.8 x 1.2 mm. Crossed-polar light. DDH 356-190
E. Diffuse oscillatory zones in crystal of plagioclase feldspar. Only a few zones can be seen. The field of view is about 0. 7 x 1.0 mm. Crossed-polar light. DDH 356-166.5
F. Oscillatory zones in crystal of plagioclase feldspar. Many zones can be seen in this crystal. The zones are roughly concentric in orientation. The field of view is about 0.4 x 0.6 mm. Crossed-polar light. DDH 342-84.5
G. Oscillatory zones and synnuesis twinning in crystal of plagioclase feldspar. The twinning
pattern includes a broad central zone surrounded by a narrow peripheral area with multiple
zones. The field of view is about 0.7 x 1.0 mm. Crossed-polar light. DDH 331-218.5
H. Multiple oscillatory zones in crystal of plagioclase feldspar. The crystal is about 1.3 x 2 mm in size. DDH 342-84.5.
