Spessartite

from Wikipedia, the free encyclopedia
Spessartite from the area south of Olbia (Sardinia)

Spessartite is the name for a rock from the group of lamprophyres with hornblende and augite , in which the proportion of plagioclase in the base mass is higher than the proportion of orthoclase . The green or brown horn blends usually form coarser Einsprenglinge in a fine base. This matrix can addition to the aforementioned minerals and biotite , quartz (mostly as Pseudomorphose after olivine ), apatite contained and iron oxides.

The name of the rock goes back to the Spessart , where Spessartite veins with ages from 330 to 320 million years are common. As a rock name, Spessartite was introduced into the specialist literature by Karl Heinrich Rosenbusch in 1896. As early as 1849 August Breithaupt had used the name for a mineral "titanium iron".

literature

  • ND Chatterjee: The lamprophyre of the Spessart and the lamprophyre problem . News from the Academy of Sciences Göttingen, II. Mathematical-Physical Class, 1, pp. 1–24. 1959
  • Wolfhard Wimmenauer: Petrography of igneous and metamorphic rocks. Enke, Stuttgart 1985, p. 147. ISBN 3-432-94671-6

Individual evidence

  1. ^ V. von Seckendorff, MJ Timmerman, W. Kramer & P. ​​Wrobel: New 40 Ar / 39 Ar ages and geochemistry of late Carboniferous-early Permian lamprophyres and related volcanic rocks in the Saxothuringian Zone of the Variscan Orogen (Germany) In: Wilson, M., Neumann, E.-R., Davies, GR, Timmermann, MJ, Heeremans, M. & Larsen, BT (Eds.) Permo-Carboniferous Magmatism and Rifting in Europe. Geological Society London, Special Publications 223, 335-359. 2004
  2. ↑ A. Breithaupt: The Paragenesis of the minerals. Freiberg 1849, p. 77