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Minerals/Fossils - Dravite

Minerals/Fossils - Dravite

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Datum izida:3/20/2000 11:00:00 PM
Oblikovanje:Matjaž Učakar
Motiv:Dravite
Tisk:DELO - TISKARNA d. d., Ljubljana
Izvedba:4-colour offset
Papir:Chancellor oba free L.S.PVA GMD 102g, gummed
Velikost:
Zobčanje:comb
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Minerals/Fossils - Dravite

<b>DRAVITE</b><p>The mineral dravite is magnesium tourmaline with a characteristic golden brown to dark brown, or almost black colour. It was named after the river Drava by the well-known Austrian imperial mineralogist Tschermak in 1883. The dravite appears in triangular or hexagon columns - prisms ending predominately in trigonal pyramids. The crystals mostly reach 1 cm in size. The biggest ones found measured around 10 cm. Dravite's specific gravity is between 3.0 g/cm3 and 3.15 g/cm3 and it has a hardness of 7 to 7.5. <br>The specimens of Slovene dravite are very valuable to mineral collectors and museums around the world as they come from dravite's discovery locality. They are also appreciated for their beautiful shapes, typical colour and the colour contrast with the rock in which it is found. The dravite and its deposit Dobrava near Dravograd belong to the Slovene heritage of inanimate nature.<br>