| ... As already mentioned elsewhere, mining in Ilmenau dates back to the year 1200. In 1216, Count Poppo v. Henneberg was enfeoffed with the Bergregal by Friedrich den II. At that time one had discovered mineralised steep copper slate near Roda and on the Sturmheide. Presumably, individual miners had ... more... As already mentioned elsewhere, mining in Ilmenau dates back to the year 1200. In 1216, Count Poppo v. Henneberg was enfeoffed with the Bergregal by Friedrich den II. At that time one had discovered mineralised steep copper slate near Roda and on the Sturmheide. Presumably, individual miners had been enfeoffed, who extracted copper slate and sandstone in accordance with the mining freedom. This is generally regarded as the beginning of the first main period of Ilmenau mining. The ore was mined in small open pits to a maximum depth of 50m. ... A Contribution of {:10697:} |
| Aragonite is a calcium carbonate, chemically identical with calcite. The mineral calcite, however, differs from Aragonite due to its internal crystal structure. While the crystal system of calcite is trigonal, the system of aragonite is rhombic. Dense masses of small aragonite crystals are difficul ... moreAragonite is a calcium carbonate, chemically identical with calcite. The mineral calcite, however, differs from Aragonite due to its internal crystal structure. While the crystal system of calcite is trigonal, the system of aragonite is rhombic. Dense masses of small aragonite crystals are difficult to distinguish from calcite, but they are larger, they show a distinct habit. A lot of chapters in this portrait will give you much more details about this interesting mineral. Written and investigated by Peter Seroka. (Article in german) |
| The Mineralientage München 2025 – The Munich Show once again showcased a fascinating variety of minerals, fossils, and jewelry. Although visitor numbers appeared slightly lower than last year, the fair remained vibrant and diverse. Highlights included the collector displays and the special exhibitio ... moreThe Mineralientage München 2025 – The Munich Show once again showcased a fascinating variety of minerals, fossils, and jewelry. Although visitor numbers appeared slightly lower than last year, the fair remained vibrant and diverse. Highlights included the collector displays and the special exhibition on natural resources, while the fossil section was somewhat smaller. Some visitors expressed a wish for more seating areas, opportunities for exchange, and more eye-catching advertising, yet overall the event left a very positive impression and remains a must-visit for collectors and families alike. |