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Hydrothermally altered REE miarolitic Pegmatite

Hydrothermal (Au-Te-Bi) + Pegmatite (Miarolitic, REE)

Required Geological Setting

Plutonic rocks


The REE mmiarolitic pegmatites subjected to very low temperature hydrothermal alteration. Pegmatites were altered by 50 - 100 degree hydrothermal fluid at deep circumstances. Together with same minerals as the Au-Bi-Te hydrothermal deposit by low temperature hydrothermal fluids, milarite and stokesite were formed by decomposition of beryl and cassiterite, respectively.

Mineral Assemblages (Pegmatite residues)

Quartz, Feldspar, Muscovite, Zinnwaldite, Fluorite, Beryl, Cassiterite

Mineral Assemblages

Milarite, Stokesite

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