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suessite
Suessite is a rare iron silicide mineral with chemical formula: Fe3Si.〔(2010) Suessite Glossary of Geology, American Geological Institute, . Accessed 13 September, 2010.〕 The mineral was named after Professor Hans E. Suess. It was discovered in 1982 during the chemical analysis of The North Haig olivine pigeonite achondrite (ureilite). It is a cream white color in reflected light, and ranges in size from 1 μm "blebs" to elongated grains that can reach up to 0.45 cm in length.〔Keil, K., Berkley, J. L., and Fuchs, L.H. (1982) Suessite, Fe3Si: a New Mineral in the North Haig Ureilite. American Mineralogist, 67, 126.〕 This mineral belongs in the isometric crystal class. The isometric class has crystallographic axes that are all the same length and each of the three axes perpendicular to the other two. It is isotropic, has a structural type of DO3 and a crystal lattice of BiF3.〔Norvgorodova, M.I., Yosopov, R.G., Dmitrieva, M.T., Tsepin, A.I., Sivtsov, A.V., Gorshkov, A.I., Korovoshkin, V.V., and Yakubovskaya, N.Y. (1984) First Occurrence of Suessite on the Earth. International Geology Review, 26, 98.〕 == Optical Properties ==
Suessite is an isotropic mineral, Isotropism is defined as an optical property of a mineral that stays the same from whatever direction it is observed. In thin-section microscopy, an isotropic mineral has only one refractive index. This means that light that passes through the mineral is not split into two different directions, but it passes through unchanged.〔Klein, C. and Dutrow, B. (2008) The Manual of Mineral Science, 23rd Edition〕 Suessite, as determined from the previous definition, only has one index of refraction. When Keil, Fuchs, and Berkley first discovered the mineral they described it as having a relatively low optical relief, but there was no determination of the index of refraction.〔Keil, K., Berkley, J. L., and Fuchs, L.H. (1982) Suessite, Fe3Si: a New Mineral in the North Haig Ureilite. American Mineralogist, 67, 126.〕 In plane polarized light, suessite is a reddish-brown color that shows no pleochroism.〔Klein, C. and Dutrow, B. (2008) The Manual of Mineral Science, 23rd Edition〕
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