GEO 2163 Lecture Notes - Lecture 1: Orthorhombic Crystal System, Hexagonal Crystal Family, Crystal System
8 Jan 2018
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Document Summary
Prehnite it is monomineralic and has an orthorhombic crystal system. Has a habit that is stalactite and is globular. It is able to scratch the glass plate (6) and is vitreous. It is white in color, but can also be green. Muscovite it is monomineralic and has a monoclinic crystal system. It is not very hard (2-2. 5) and has a vitreous luster. It is a clear/dark color with a white streak. Can come in polymineralic form where it is still sheety but looks more massive. Biotite there are two different forms, one, white is monomineralic, and the other, which is polymineralic (2minerals). They both have a monoclinic system that is very micaceous/sheety. It is however not broken up into sheets, they are stacked upon each other. It is black in color and has a grey streak and is vitreous in luster. Phlogopite there are two different forms, one, monomineralic and the other is polymineralic.
