Unformatted text preview: Face A: a = 17.96, b = 2.73, c = 20.44 Face B: a = 4.49, b = 5.46, c = ∞ Zircon: Unit cell: a = 6.60, c = 5.98; α = γ = β = 90º Axial intercepts of faces: Face A : a 1 = 2.20, a 2 = 6.60, c = 11.96 Face B: a 1 = 6.60, a 2 = 6.60, c = 2.99 a) Write down the chemical formula for each mineral. b) To which crystal system do they belong? Why do they belong to those systems? c) Neatly and to scale, draw the crystallographic axes of both minerals. d) The axial intercepts of two crystal faces are given for each mineral (in cm). Calculate the Miller Indices for both faces of both minerals....
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- Fall '10
- Crystallography, axial intercepts