| 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) |
| The term used in the plural "pyrites" has often been misused in the past or in common for marcasite, chalcopyrite, pyrrhotite and other yellow to brass-colored minerals. The word pyrite is derived from the Greek "pyrites lithos" (derived pyr = fire and lithos = stone) and describes a characteristic ... moreThe term used in the plural "pyrites" has often been misused in the past or in common for marcasite, chalcopyrite, pyrrhotite and other yellow to brass-colored minerals. The word pyrite is derived from the Greek "pyrites lithos" (derived pyr = fire and lithos = stone) and describes a characteristic of the mineral, when rubbing against steel or flint (flint) to generate sparks. In prehistoric tombs pyrite concretions and unrolled pyrite where found, which supposed to be used for lighting a fire. (Article in German) |