GEO 2163 Lecture Notes - Lecture 10: Cordierite, Conchoidal Fracture, Plagioclase

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

Document Summary

Part 1: descriptions: albite: a hard mineral with a hardness of 7. Crystals are usually granular and can be either gray, white, or blue with a white streak: labradorite: a hard mineral with a hardness of 7. The mineral itself is gray with a white streak and at certain angles blue and purple can be seen: orthoclase: a mineral with granular crystals that are vitreous and transparent. Crystals are gray-yellow with a hardness of 6 and white streak: microcline: a bluish green mineral that appears blocky with a white streak. Crystals are vitreous and transparent with a hardness of 6: amazonite: the hardness is approximately 6. Which a blue green color and green streak. The habit is blocky or tabular with vitreous and translucent crystals: nepheline: a white-gray mineral that comes massive with a white streak. Crystals are vitreous and translucent with a hardness of 6: leucite: crystal color usually is yellow-gray and appear coarse, with a white streak.