Fluorite

specimen number:
8311495

location:
Erongo Mts., Namibia

description:

A large thick loose twinned light green crystal of fluorite. Complete all around, cleaved on the base or bottom. In great condition.

The Erongo Mountains, located in the Erongo Region of central-western Namibia, represent a classic mineralogical locality celebrated for its distinctive pocket-grown crystal assemblages, including exceptional interpenetrating twinned fluorite. Geologically, this rugged, circular complex is a massive Cretaceous-age anorogenic ring dike system and collapsed caldera that intruded into ancient Neoproterozoic schists of the Damara Sequence. The crystallization of late-stage, highly evolved granitic pegmatites and miarolitic cavities within the inner Erongo granites produced abundant open spaces where low-temperature hydrothermal fluids precipitated sharp, deep green, blue-green, and bicolored fluorite cubes. These crystals frequently form classic penetration twins, where two cubes grow into and through one another around a shared central axis, creating sharp configurations often found on a matrix of white feldspar, dark schorl tourmaline, or smoky quartz. Historically, small-scale semi-precious stone surface grubbing began in the early to mid-twentieth century, but systematic manual extraction by independent local artisanal miners dramatically accelerated during the late 1990s and early 2000s as the global mineral specimen market recognized the unique quality of the pegmatite pockets. While large-scale commercial industrial quarrying has never been established due to the steep, rugged terrain, informal small-scale family operations and specialized partnerships have continued continuously for nearly three decades. Through 2026, active manual specimen mining remains productive across properties like the Hohenstein and Davib farms, ensuring that these distinctive penetration twinned fluorite habits continue to serve as an important academic benchmark for researching post-magmatic volatile crystallization within alkaline igneous complexes.

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