In the Parzival of Wolfram von Eschenbach, the ultimate source of which is identical with that of Chretien, on the contrary, the Grail is represented as a precious stone, brought to earth by angels, and committed to the guardianship of the Grail king and his descendants.
Throughout the world, primary deposits of tinstone are in or closely connected with granite or acid eruptive rocks of the same type, its mineral associates being tourmaline, fluorspar, topaz, wolfram and arsenical pyrites, and the invariable gangue being quartz: the only exception to this mode of occurrence is to be found in Bolivia, where the tin ore occurs intimately associated with silver ores, bismuth ores and various sulphides, whilst the gangue includes barytes and certain carbonates.
The German poet, Wolfram von Eschenbach, whose Parzival in parts closely agrees with the Perceval and who was long held to be a mere translator of Chretien, differs widely in the setting of his story.
These singers, who, for the most part, belonged to the artisan and trading classes of the German towns, regarded as their masters and the founders of their gild twelve poets of the Middle High German period, among whom were Wolfram von Eschenbach, Konrad von Wurzburg, Reinmar von Zweter and Frauenlob.
In them the medieval lay point of view became articulate, finding perhaps its most remarkable expression in the ideas of religious toleration proclaimed by Waltber von der Vogelweide and Wolfram von Eschenbach.
Tungsten may be prepared from wolfram by heating the powdered ore with sodium carbonate, extracting the sodium carbonate with water, filtering and adding an acid to precipitate tungstic acid, H 2 W0 4.
The minnesinger Wolfram von Eschenbach based his Willehalm on a French original which must have differed from the versions we have.
The figures for the more important minerals are as follows: Gold ore, manganese ore and uranium ore are produced in small quantities, and the list of minerals worked in the United Kingdom also includes chalk, lead, alum, phosphate of lime, chert and flint, gravel and sand, zinc ore, gypsum, arsenic, copper, barytes, wolfram and strontium sulphate.
Six logarithms omitted in Schulze's work, and which Wolfram had been prevented from computing by a serious illness, were published subsequently, and the table as given by Vega is complete.
A website called Wolfram Alpha is amazing to me, especially in its aspirations.