EOSC 118 Lecture Notes - Lecture 22: Sodalite, Jadeite, Hauyne
28 Oct 2016
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Document Summary
Rock (polymineralic) comprised primarily of the pyroxene mineral jadeite. Granular texture due to blocky texture of pyroxene. Silky texture due to fibrous nature of amphibole. Deposits form near surface close to cu-bearing intrusie rocks as result of surface waters. Turquoise percolating to depth and interacting with these cu-rocks. Egyption deposits important in ancient civilizations, now exhuasted. Iran deposits were best quality until ran out. North amrican deposits associated with cu ore deposits. Graded on colour as well as texture of material and presence of matrix. Most sought after = stones with little texture or matrix present. Mixture of lazurite, pyrite, and calcite ith minor diopside, sodalite, and hauyne. Blue colouration comes from lazurite, sodalite, and hauyne. Mainly found in russia, poland and dominican republic. Baltic amber is from russia, poland, and those around baltc sea. Fossil record can be used to deduce rock"s age. Differences in color due to the mineral aragonite.
