10. SmuHlkolWislk'i W. Eastern part of the
Iu.ere. GneilSB boun)d'a!ry agahllgt 1Ib.e ~a JMts. Sdl1i9l;-Serioas (West SU'detes). ~. l~, VOIl. 'X!lV, No. 4.
SUMMARY
Deposit discovered by the present author at Olesz-na Podg6rska was formed in a tensioOlesz-nally, gaping fissure, within a dis'location zone at the boundary of the Pog6rze Izerskie gneissose complex and the Kaczawskie G6ry schist series. Tl;1e deposit consists of, coarse-grained, milky-white quartz that almost completely ,lacks any ingrowths of other minerals and reveals iron hydroxide incrustation of fracture planes. Simple' chemical cleaning allows us
to
obtain milled product that, in tenns, of FetO~, TiOil and AlaO, contents, correspondsto
the roCk crystal ex-ploited in BrazfL It is also the P'!JI'est product so far obtained in Poland from home mineral raw ma-terials. The quality of the mineral raw materials,from Oleszna Podg6rska is
a
result of its genetical dissimilarity, as compared with the other quartz deposits in the area of West Sudetes. . ,. Quartzite that is exploited in the area of Izerskie Garby was formed as a result of metasomatic replace-ment of rocks by quartz in the dislocation zone • .on the other hand, conformable quartzite intercalations
in en,eisses tin 1tJ.e vd:ciInity
at
iBaroinek and othe'r similar forms are of polygenic nature and, most probably, may be relatedto
acid pyroclastic rocks.11. Sll.:'8JlematCha J. Sza,lamac,ha M. r - 0
lS'treiaie ~dkal::y\j'Dej ~ Jrz.elisIkIiegIo
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