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Minerals - Zoisite

Minerals - Zoisite

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Datum izida:3/18/2005 11:00:00 AM
Oblikovanje:Matjaž Učakar
Motiv:Zoisite
Tisk:Poštovní tiskárna cenin, Praha a. s., Češka
Izvedba:4-colour offset
Papir:Tullis Russell fluo litho 100 g/m2, gummed
Velikost:
Zobčanje:Comb
Ilustracija:
Fotografija:Miha Jeršek
Pošta:
Poštna številka:

Minerals - Zoisite

<b>Zoisite</b><p>Two hundred years ago, European mineralogists announced that a new mineral had been discovered. It was named after Baron Sigmund (Žiga) Zois ? a mentor and benefactor of numerous Slovenian artists and scientists at the time of the Enlightenment, natural scientist, mineralogist and collector ? who supplied the first mineral specimens. A previously unknown mineral was found on Svinška Planina (the Sau-Alp Mountains) in Carinthia by a mineral dealer Simon Prešeren. He gave the mineral specimens to Zois who was at the time building up his collection of minerals, ores and rocks. After Zois's death, the collection became one of the founding collections of Slovenia's first museum ? Carniolian Museum, which was established in 1821 and opened to public view 10 years later. Today, the collection is housed in the Natural History Museum in Ljubljana and it contains minerals from famous mineral localities around the world, most of which are not accessible anymore. Among them is also zoisite from Sviška Planina which holds a special place in the collection. The stamp depicts a zoisite specimen from the collection.Zoisite mostly occurs in metamorphic rock. Though it is a common rock-forming mineral, it rarely occurs in regular crystals. The mineral is noted for its remarkably strong trichroism. This is a quality possessed by some crystals of presenting three different colours depending on the angle they are viewed at. The opaque prismatic crystals are usually white to grey in colour. If coloured, zoisite is used as a gemstone or ornamental stone. In 1967 a violet blue gemstone variety was found in Tanzania. Named after its country of origin, tanzanite has found wide acceptance as a fine gemstone. Besides tanzanite, zoisite has also produced a rose-red variety containing manganese known as thulite. In Slovenia, zoisite also occurs on the Pohorje mountain range. ZoisiteTwo hundred years ago, European mineralogists announced that a new mineral had been discovered. It was named after Baron Sigmund (Žiga) Zois ? a mentor and benefactor of numerous Slovenian artists and scientists at the time of the Enlightenment, natural scientist, mineralogist and collector ? who supplied the first mineral specimens. A previously unknown mineral was found on Svinška Planina (the Sau-Alp Mountains) in Carinthia by a mineral dealer Simon Prešeren. He gave the mineral specimens to Zois who was at the time building up his collection of minerals, ores and rocks. After Zois's death, the collection became one of the founding collections of Slovenia's first museum ? Carniolian Museum, which was established in 1821 and opened to public view 10 years later. Today, the collection is housed in the Natural History Museum in Ljubljana and it contains minerals from famous mineral localities around the world, most of which are not accessible anymore. Among them is also zoisite from Sviška Planina which holds a special place in the collection. The stamp depicts a zoisite specimen from the collection.Zoisite mostly occurs in metamorphic rock. Though it is a common rock-forming mineral, it rarely occurs in regular crystals. The mineral is noted for its remarkably strong trichroism. This is a quality possessed by some crystals of presenting three different colours depending on the angle they are viewed at. The opaque prismatic crystals are usually white to grey in colour. If coloured, zoisite is used as a gemstone or ornamental stone. In 1967 a violet blue gemstone variety was found in Tanzania. Named after its country of origin, tanzanite has found wide acceptance as a fine gemstone. Besides tanzanite, zoisite has also produced a rose-red variety containing manganese known as thulite. In Slovenia, zoisite also occurs on the Pohorje mountain range.