| Als Bestimmungsmerkmal fallen zweifarbige Einsprenglinge (blaugrau und rosarot) auf, die allerdings auch in der Variante RP26 vorkommen. Das wichtigste Kriterium, um diese beiden Varianten auseinander halten zu können, sind die in der intrusiven Variante vorhandenen, schmalen Zonierungen, welche die ... moreAls Bestimmungsmerkmal fallen zweifarbige Einsprenglinge (blaugrau und rosarot) auf, die allerdings auch in der Variante RP26 vorkommen. Das wichtigste Kriterium, um diese beiden Varianten auseinander halten zu können, sind die in der intrusiven Variante vorhandenen, schmalen Zonierungen, welche die blaugrauen Kristalle dünn umschließen. Generell finden sich 2 Arten von Einsprenglingen in der intrusiven Variante: 1. kleine, zerbrochen wirkende rosarote und 2. größere, blaugraue mit schmaler Zonierung, welche die gleiche Farbe aufweist, wie die der Kleineren Einsprenglinge. ... Ein Beitrag von Jörg-Florian J. |
| After the discovery of silver deposits in Christiansdorf - the now called Freiberg - over the time the mining was also expanded on the upper mountain. Thus from about 1240, the tin deposits (with the beginnings of subsurface mining also silver) around Ehrenfriedersdorf was mined. By finding rich si ... moreAfter the discovery of silver deposits in Christiansdorf - the now called Freiberg - over the time the mining was also expanded on the upper mountain. Thus from about 1240, the tin deposits (with the beginnings of subsurface mining also silver) around Ehrenfriedersdorf was mined. By finding rich silver adits in the 2nd third of the 15th Century the great mountain towns like Schneeberg (municipal law since 1477) and Annaberg (municipal law since 1496) was founded. (Article in german) |
| Calcite is one of the most abundant natural minerals. It is found in very different shapes, both compact as limestone as well as sinter in caves and in the crystalline state. But even in our daily life calcite is always present: in some regions it blockes water pipes as "chalk", we build our houses ... moreCalcite is one of the most abundant natural minerals. It is found in very different shapes, both compact as limestone as well as sinter in caves and in the crystalline state. But even in our daily life calcite is always present: in some regions it blockes water pipes as "chalk", we build our houses with it, it is in our food chain and without it we could not stand upright. Calcite is not rare, but the varied mineral on Earth. The variety of forms and variations of the forms of calcite are unmatched in the world of mineralogy. By 2009, more than 800 Calcit forms have been described. |
| The study of twins starts due to the very first beginnings of crystallography as a science. Not negligible for this reason, the idea or the concept of a twin crystal are often associated with a macroscopic building. Modern studies at the nano scale have shown that the formation of twins can occur at ... moreThe study of twins starts due to the very first beginnings of crystallography as a science. Not negligible for this reason, the idea or the concept of a twin crystal are often associated with a macroscopic building. Modern studies at the nano scale have shown that the formation of twins can occur at a very early stage of crystal growing. Based on these findings, it does beg the request to reconsider the formation mechanisms, and adjacency to the newly different categories. (Text in german) |