Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Leucaugite,Sing Sing, N.Y. Augite. Augite twin. negative and positive pyramids v and v = a: b:2c. Angles arem.m=2,y° 10; // = 131° 31; // = 120° 49z;^=9548; cp = 146° il; ?/= 137° 58;cv = 130 6; cv= 114° ^ig. Contact twins, twinning plane a, Fig. 598,are common. Also twin lamellae parallel c,shown by striations on the vertical faces andby basal parting, Fig. 599. Optically +.Axial plane b. Strong double refraction.Varying axial angle. Usually not stronglypleochroic. Physical Characters. H., 5.6. Sp.

GLIX-115-2AJHDN7

Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Leucaugite,Sing Sing, N.Y. Augite. Augite twin. negative and positive pyramids v and v = a: b:2c. Angles arem.m=2,y° 10; // = 131° 31; // = 120° 49z;^=9548; cp = 146° il; ?/= 137° 58;cv = 130 6; cv= 114° ^ig. Contact twins, twinning plane a, Fig. 598,are common. Also twin lamellae parallel c,shown by striations on the vertical faces andby basal parting, Fig. 599. Optically +.Axial plane b. Strong double refraction.Varying axial angle. Usually not stronglypleochroic. Physical Characters. H., 5.6. Sp.
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Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Leucaugite,Sing Sing, N.Y. Augite. Augite twin. negative and positive pyramids v and v = a: b:2c. Angles arem.m=2,y° 10; // = 131° 31; // = 120° 49z;^=9548; cp = 146° il; ?/= 137° 58;cv = 130 6; cv= 114° ^ig. Contact twins, twinning plane a, Fig. 598,are common. Also twin lamellae parallel c,shown by striations on the vertical faces andby basal parting, Fig. 599. Optically +.Axial plane b. Strong double refraction.Varying axial angle. Usually not stronglypleochroic. Physical Characters. H., 5.6. Sp.

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