(Malá Jizerská louka, Liberecký Kraj)
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: zircone (up to 30 %, max. 9 g), ilmenite (okolo 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 and their vein accompanying rocks, part from quartz veins. The gneiss of some is not resolved.
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:42 entries listed. 27 valid minerals.
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