| For Mineral collectors who travel in their vacation to the mining area of La Union, the mina Precaución is an easy to reach and in 2010 a worthwhile target to collect attractive pieces with hemimorphite, calcite and more minerals on contrast rich matrix. Equipped with helmet, forehead lamp, chisel ... moreFor Mineral collectors who travel in their vacation to the mining area of La Union, the mina Precaución is an easy to reach and in 2010 a worthwhile target to collect attractive pieces with hemimorphite, calcite and more minerals on contrast rich matrix. Equipped with helmet, forehead lamp, chisel and hammer nice pieces can be rescued easily, taking into account the security rules for mining visits. |
| 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) |
| ... Da offene Flammen häufig zu Explosionen von Methangas in Kohlebergwerken führten, schrieben Grubenbesitzer einen hoch dotierten Preis zur Erfindung einer explosionssicheren Lampe aus. So wurde die Davy-Lampe entwickelt. Das Geheimnis war ein simples, engmaschiges, Drahtgitter um die offene Flamm ... more... Da offene Flammen häufig zu Explosionen von Methangas in Kohlebergwerken führten, schrieben Grubenbesitzer einen hoch dotierten Preis zur Erfindung einer explosionssicheren Lampe aus. So wurde die Davy-Lampe entwickelt. Das Geheimnis war ein simples, engmaschiges, Drahtgitter um die offene Flamme. Dieses Gitter verhindert, durch Wärmeableitung, die Entzündung von Gas außerhalb der Lampe. Die Weiterentwicklung war der Einsatz von wiederaufladbaren Akkus statt ... Ein Beitrag von Peter Seroka und Wilhelm W. |
| Olivine is not a separate mineral, but a member belonging to the forsterite-fayalite mixing series. Olivine belongs to the olivin-groupe whose end-members are calcio-olivine and tephroite. Forsterite is a magnesium silicate; fayalite an iron silicate. If commonly is spoken of olivine, it is usually ... moreOlivine is not a separate mineral, but a member belonging to the forsterite-fayalite mixing series. Olivine belongs to the olivin-groupe whose end-members are calcio-olivine and tephroite. Forsterite is a magnesium silicate; fayalite an iron silicate. If commonly is spoken of olivine, it is usually a more or less iron-rich forsterite. The color of olivine is generally yellowish green, olive green to black. You will find much more interesting details in our portrait about this common mineral series. Written and investigated by Peter Seroka. (Article in german) |
| ... 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:} |
| Beim Antilope Canyon handelt es sich um eine in Jahrtausenden aus Navajo Sandstein heraus gespülte Schlucht, die durch ihre geschwungen Formen und Lichtspiele einen besonderen Reiz auf den Betrachter ausübt. Beste Zeit für einen Besuch ist Mittag bis Nachmittag, da dann das Beste Farbspiel zu beobac ... moreBeim Antilope Canyon handelt es sich um eine in Jahrtausenden aus Navajo Sandstein heraus gespülte Schlucht, die durch ihre geschwungen Formen und Lichtspiele einen besonderen Reiz auf den Betrachter ausübt. Beste Zeit für einen Besuch ist Mittag bis Nachmittag, da dann das Beste Farbspiel zu beobachten ist. Ein Besuch sollte nur bei strahlendem Sonnenschein vorgenommen werden, da nur dann die farblichen Differenzen von violett bis leuchtendem Orange richtig zur Geltung kommen. Die unterschiedliche Lichtintensität im Canyon vermittelt den Eindruck von verschiedenfarbigem Sandstein... |
| Emerged as a product of erosion from water, frost and wind which has shaped the spectacular pillars (hoodoos) the Bryce Canyon National Park is one of the most spectacular natural amphitheater. The eroded Claron limestone in which also fossils are found, leaves the impression of a subtle army from l ... moreEmerged as a product of erosion from water, frost and wind which has shaped the spectacular pillars (hoodoos) the Bryce Canyon National Park is one of the most spectacular natural amphitheater. The eroded Claron limestone in which also fossils are found, leaves the impression of a subtle army from limestone warriors. Named after the Mormon Pioneer Ebenezer Bryce, the natural spectacle was 1928 declared as national park. |