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Barite/Gornji Štrihovec

Barite/Gornji Štrihovec

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Datum izida:3/23/2003 11:00:00 PM
Oblikovanje:Matjaž Učakar
Motiv:Barite/Gornji Štrihovec
Tisk:DELO Tiskarna d. d.
Izvedba:4-barvni ofset
Papir:Chancellor oba free L.S.PVA 102g, gumiran
Velikost:
Zobčanje:grebenasto
Ilustracija:
Fotografija:Miran Udovč
Pošta:
Poštna številka:

Barite/Gornji Štrihovec

<b>Barite/Gornji Štrihovec</b><p>Barite is a common mineral that can be found in ore veins and sedimentary rocks. Its large and beautiful crystals occur in a variety of forms, making very attractive specimens. Barite is the mineralogical name for barium sulfate, BaSO4 with relatively high specific gravity, which makes it valuable for commercial use in various industries such as mining industry (as a weighting agent in drilling muds), paper and pigment industries and medicine, where it is used in the &quot;barium milkshake&quot; administered before gastro-intestinal tract radiography. Barite is relatively soft, measuring 3-3.5 on Moh’s scale of hardness, and has good cleavage. It is practically insoluble under ordinary conditions, but can be easily dissolved when exposed to increased temperature and pressure. As soon as the latter decrease, it crystallizes when conditions are favourable. Slovenia's largest and most beautiful barite crystals up to 20 cm in length were found at Gornji Štrihovec when building the motorway section Pesnica – Šentilj. Varying from completely transparent to slightly coloured ones, these samples were found in fairly large concretionary nodular masses with radiating and crisscross cracks inside them, also referred to as septarian nodules. The stamp depicts the barite crystal occurring on yellow calcite matrix and measuring 22 x 16 cm in size. <p>Dr. Mirjan Žorž