Siderite

specimen number:
2262124

location:
Allevard, Grenoble, Isere, Auvergne-Rhone-Alpes, France

description:
Classic French specimen with large lustrous rhombohedral crystals of siderite in a cluster without matrix. In good condition.

Allevard, located in the Isere department of southeastern France, is situated within the Belledonne Massif, a region defined by its complex Alpine geology. The area is characterized by the Presence of Carboniferous and Triassic sedimentary layers that underwent significant tectonic deformation and hydrothermal alteration, leading to the formation of extensive iron-bearing veins. The district is a classic locality for siderite, which occurs as large, well-formed rhombohedral crystals often exhibiting a distinct brownish-yellow to deep tan color and a pearly to vitreous luster. Historically, mining and quarrying in Allevard began as early as the Roman era, but reached industrial prominence between the 17th and 19th centuries when the high manganese content of the local ore made it ideal for producing high-quality steel. Major operations like the La Taillat mine drove the regional economy until the gradual decline of the local iron industry led to the cessation of most large-scale underground mining by the early 20th century. Today, the mining heritage is preserved through the Musee d'Allevard, and the site remains a significant area for geological research into the mineralizing fluids of the French Alps through 2026.

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