GEO 2163 Lecture Notes - Lecture 9: Pleochroism, Stalactite, Orthorhombic Crystal System

• School: University of Ottawa
• Department: Geology
• Course: GEO 2163
• Professor: Moisil Ingrid

Document Summary

Habit plates or platy aggregates six sided plates tabular crystals, foliated sheets. Six sided , more often in fine play aggregate masses. Very tiny crystals in earthy aggregates tabular platy. Never in distinct crystals, radiating foliated aggregates perfect basal perfect basal perfect basal cleavage cleavage cleavage perfect basal cleavage perfect basal cleavage. Friable, earthy, fibrous aggregates. microcrystalline perfect basal perfect basal cleavage cleavage. Columnar forms columns, crystalline- course-occurs as well formed coarse sized crystals, prismatic basal. Platy, scaly aggregates stalactite aggregates perfect basal perfect basal cleavage cleavage. Massive granular rock, prismatic common texture observed in granite and other igneous poor. Color white, greenish white, grey and brown. white, pale yellow greyish white, green, yellow and brown. Light to emerald green, light toe deep sky blue, blue- green, yellow, pink, purple, various colors translucent translucent green, golden yellow to brown light green/greenish white. Light to dark blue, purplish-blue, brown, yellow, gray.