| Gypsum needels and blue Baryte have made this mine known for mineral collectors. A recent report from Sept. 2012 shows that good finds are still possible. To visit this mine is relatively easy. The evacuation of the gypsum needels on the other hand is more difficult. Unfortunately, vandals have left ... moreGypsum needels and blue Baryte have made this mine known for mineral collectors. A recent report from Sept. 2012 shows that good finds are still possible. To visit this mine is relatively easy. The evacuation of the gypsum needels on the other hand is more difficult. Unfortunately, vandals have left their mark, but read and see it yourself. A report by Stefan Schorn. (Article in German) |
| Der Devils Tower (auch Mateo Tepee oder Bear Lodge) ist eine freistehende markante, säulenförmige Felsformation aus porphyrischem Phonolith im Crook County, im Nordosten von Wyoming, nahe der Grenze zu South Dakota. Seine absolute Höhe (über NN) beträgt 1558 m, er überragt die umgebende Ebene auf ei ... moreDer Devils Tower (auch Mateo Tepee oder Bear Lodge) ist eine freistehende markante, säulenförmige Felsformation aus porphyrischem Phonolith im Crook County, im Nordosten von Wyoming, nahe der Grenze zu South Dakota. Seine absolute Höhe (über NN) beträgt 1558 m, er überragt die umgebende Ebene auf einem Sockel von Sedimentgesteinen um etwa 264 m. Seine Basis besitzt einen Durchmesser von ungefähr 300 m, am abgeflachten Gipfelbereich beträgt dieser etwa 120 m. |
| People have always been fascinated by precious stones because of their lustre. But not only polished gems shine. Each raw mineral has, such as mica flakes in the river sand show, its very special characteristic luster. Gloss isn't simply measurable. It is usually described by comparison with objects ... morePeople have always been fascinated by precious stones because of their lustre. But not only polished gems shine. Each raw mineral has, such as mica flakes in the river sand show, its very special characteristic luster. Gloss isn't simply measurable. It is usually described by comparison with objects of everyday life ... (in german) |
| Iin 1546 Georgius Agricola reported about a white metal which is fused to the Rammelsberg lead and silver melter and that you could scrape off. He called this metal "contrefey", because it could imitate gold. Agricola did not recognize that this metal was zinc. He further observed that a similar met ... moreIin 1546 Georgius Agricola reported about a white metal which is fused to the Rammelsberg lead and silver melter and that you could scrape off. He called this metal "contrefey", because it could imitate gold. Agricola did not recognize that this metal was zinc. He further observed that a similar metal, which he named from some unknown reasons "ZINCUM" arose under similar circumstances in Silesia during smelting. |