Bertrandite with Quartz, Fluorapatite

specimen number:
1052878

location:
Petit-Port, Nantes, Loire-Atlantique, Pays de la Loire, France

description:
Tiny micro crystals of bertrandite on matrix with quartz, fluorapatite, muscovite, and albite. The specimen comes with an antique label as shown at the end of the video and dates to the very early 20th century.

Petit-Port, located in Nantes within the Loire-Atlantique department of Pays de la Loire, France, is a historic district renowned in mineralogy as a co-type locality for the mineral bertrandite. Geologically, the area features local granitic and pegmatitic formations associated with the Armorican Massif, where hydrothermal and pneumatolytic processes interacted with volatile-rich rock environments. Mineralogically, the historic quarries and local stone exposures near Petit-Port and the adjacent Barbin district yielded the initial material studied in the late 19th century, establishing bertrandite as a distinct hydrous beryllium silicate species that frequently forms through the alteration or replacement of earlier beryl crystals.

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