| 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. |
| 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) |
| Unser Einsteigerguide ist eine kleine Anleitung Dir selbst zu helfen oder richtig nach Hilfe zu fragen. Die passenden Informationen helfen Dir schnell eine Antwort zu erhalten und dem Fachmann Dir Auskunft zu erteilen. Nehme Dir bitte die 10 Minuten Zeit um den Guide durchzulesen. Ein lesenswerter B ... moreUnser Einsteigerguide ist eine kleine Anleitung Dir selbst zu helfen oder richtig nach Hilfe zu fragen. Die passenden Informationen helfen Dir schnell eine Antwort zu erhalten und dem Fachmann Dir Auskunft zu erteilen. Nehme Dir bitte die 10 Minuten Zeit um den Guide durchzulesen. Ein lesenswerter Beitrag der Sammlergemeinschaft |