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Gem materials and gold nuggets

Valuable mineral and rock specimens can be studied using special laboratory methods that are virtually non-destructive. Typical materials include gemstones, gold nuggets, possible meteorites, museum pieces and various collector specimens. Optical documentations are essential in the evaluation and determination usually coupled with image-analytical methods. Generally the chemical composition and textural characteristics of the material are likewise determined. Several of the research methods have been developed in GTK Research Laboratory. Studies are made to private companies and persons, associations, governmental institutes, museums and universities.

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Chalcedony occurrences in Vuotso, Lapland, have been studied and evaluated with Jorma Valkama, PSY. Photomicrograph: Kari A. Kinnunen. Report (in Finnish):  arrow Open The largest mixed nugget composed of gold and quartz (192 g, 48 mm) known from Finland was found in August 2008 from Sotajoki, northern Finland, by Maija and Risto Vehviläinen. This rare nugget was studied and documented in Research Laboratory in September 2008. Photo: Kari A. Kinnunen. Report (in Finnish): arrow Open The photos taken by Matti Tyni from diamonds discovered in Kaavi kimberlites during 1990's have been digitized and compiled. Photomicrograph: Matti Tyni.
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The very first ruby crystal from Finland was determined in April 2008. It was found by Marjut Telilä in 1992 from Miessijoki during gold sluicing. Photo: Kari A. Kinnunen. Report (in Finnish with English summary):
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The first bedrock occurrence of jasper in western Finland has been verified from Vimpeli Ryytimaa. Found by prospector Pekka Hietala. Photo: Kari A. Kinnunen. Publication: arrow Open
Baltian meripihka
Inclusions in Baltic amber have been analysed with professor Matti Nuorteva. The wood debris may partly originate from Paleogene forests that grew in the area of present-day Finland. Photo: Kari A. Kinnunen. Publication: arrow Open

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