Home > Pseudomorphs – March 10 > MS1765 Muscovite replacing Leucite

Muscovite replacing Leucite


Leucite is a potassium aluminosilciate which forms in lava flows. Alteration of an ancient lava flow in Turkey releases these pseudomorphs. Modern study indicates that they consist of muscovite and relict leucite (Lünel & Akiman, 1985). This specimen has a classic trapezohedral form typical of leucite. A complete crystal, rather rough, with a but of attached matrix. These came to the mineral market in the 1970s or 1980s and remain a novelty. This writer has not seen fresh leucite crystals of this size.

Price: $175

Item code: MS1765

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