Safírový potok a řeka Jizerka, Osada Jizerka, Liberecký Kraj, Česká Republika
Small placer deposit known at least since the 16th century. Heavy minerals come from Quaternary gravel terraces (0.5 to 2 m thick), mostly covered by 0.2 to 3 m of peat.
Mineral association: zircon (up to 30 %, max. 9 g), ilmenite (up to 25 %) and titanite (up to 20 %). Ferromagnetic Mg-Fe3+ variety of ilmenite is called iserine - mostly 2 to 20 mm black pebbles. Largest known sapphire 12 mm. Part of minerals came from surrounding granites, gneiss, and their accompanying vein rocks, including from quartz veins.
References
- Klaproth, M.H. (1810): Chemische Untersuchung des Iserins, Beiträge zur chemischen Kenntniss der Mineralkörper, Fünfter Band, Rottmann Berlin, 206-209
- Kotrlý, M., Malíková, P., Holub F. X.: Malá Jizerská louka, klasické naleziště drahokamové asociace. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1997, roč. 4-5, s. 25-40.
Mineral List
64 entries listed. 33 valid minerals.
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