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Framboidal – Colloform - Recrystallised Pyrite in the Granitoids of Wahkyn Area, West Khasi Hills, Meghalaya
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Petrographic studies of Proterozoic pyriteferous granitoids forming basement for upper cretaceous Mahadek sediments from Wahkyn area reveal interesting textural peculiarities of Pyrite. These pyrites also reveal interesting structural peculiarities. The three textural pyrite varieties found in the granitoids are: framboidal, colloform and recrystallised which appear both as composite aggregate as well as independent units. Various textures and variation in reflectivity, microhardness and elemental distribution of the pyrites are described. Average Co/Ni ratio along with the textural manifestation of these pyrites attests their sedimentary origin.
Keywords
Ore Mineralogy, Framboidal Pyrite, Radioactive Mineral, Wahkyn, Meghalaya.
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