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Jizerská louka (Iser meadow; Iserwiese), Jizerské Mtn (Iser Mtn), Liberec Region, Bohemia (Böhmen; Boehmen), Czech Republic
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Photo: A.Tomek
 
Name(s) in local language(s): 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.

Some minerals photographed by Lukáš Jankaj may not be from this locality: e.g. alexandrite, aquamarine, beryl, gold, emerald, topaz. (comment by P. Škácha)

Mineral List

Albite
var: Oligoclase

Almandine
Anatase
'Apatite'
Augite
'Axinite Group'
Beryl
var: Aquamarine
var: Emerald
var: Heliodor
'Biotite'
Bismuth
Bismuthinite
Bismutite
Cassiterite
'Chlorite Group'
Chrysoberyl
var: Alexandrite
'Columbite'
Columbite-(Fe)
Corundum
var: Ruby
var: Sapphire
Diopside
Epidote
'Fergusonite'
Goethite
Gold
Hematite
Hercynite
var: Picotite

Ilmenite
var: Iserine
Kaersutite
Magnetite
Molybdenite
'Monazite'
Muscovite
'Olivine'
Orthoclase
Pyrite
Pyrope
Quartz
var: Agate
var: Amethyst
var: Aventurine
var: Chalcedony
var: Citrine
var: Jasper
Quartz
var: Onyx

var: Sardonyx
var: Smoky Quartz
Rutile
Scheelite
Spessartine
Spinel
var: Chlorospinel
var: Gahnospinel
var: Pleonaste
Titanite
Topaz
'Tourmaline'
'Wolframite'
Xenotime-(Y)
Zircon


64 entries listed. 33 valid minerals.

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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.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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