Fluorite with Quartz, Pyrite, Muscovite

specimen number:
8911057

location:
Panasqueira Mines, Sao Jorge da Beira, Covilha, Castelo Branco, Portugal

description:
Very pretty combination specimen with gemmy purple cubic crystals of fluorite to 0.6 cm in size scattered attractively across the top of a colorless gemmy crystallized quartz cluster. The overall appearances green in color due to micaceous micro muscovite. Tiny crystals of pyrite are scattered throughout. This is in good condition. The specimen comes with a custom base as seen, also a previous label from the Alton collection.

The Panasqueira Mines in Beira Baixa, Portugal, opened in 1898 and, aside from a brief temporary closure in 2003, remain actively in operation today. Geologically, the deposit is hosted within a sequence of late Precambrian to Cambrian metasedimentary rocks, primarily consisting of greenschist-facies shales, slates, and greywackes of the Beira schist formation. The mineralization occurs as a sub-horizontal system of quartz veins rich in tungsten, tin, and copper, which are genetically related to an underlying hidden Hercynian granitic pluton emplaced during the Late Carboniferous period.

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