GEOS 306 Midterm: GEOS 306 University of Arizona Geo306 2014 Midterm 2
31 Jan 2019
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100 pts: (30 pts) fill in the empty cells with the appropriate point group symbol and crystal system. Weight percent following oxide weight percent were measured. 45. 403: (15 pts) enstatite, mgsio3, is an orthorhombic mineral found in meteorites and as a major component of the upper mantle. The cell parameters from a fragment of the bishopville meteorite were carefully measured as a = 18. 210. , b = 8. 812 , c = 5. 178 and z = 4 (i. e. 4 formula units per unit cell). The (200) peak was located in a diffraction experiment using cu radiation, = 1. 541838 , at 2 = 33. 08 : determine the d-spacing of (200, determine the cell parameters of pyrite, (5 pt) . This is a microscopic image of fractures in a crystal that follow characteristic cleavage planes. The photo took second place in the 2014. The image is taken looking straight down on the sample, not at an angle.
