Norra Kärr

Special thanks to the late Ingemar Johansson, who made my very first trip to there possible in 1978.

Norra Kärr, named for a farm, in the Swedish province of Smaland, about 1.5 km east of lake Vaettern and 45 km NE of Joenkoeping, is one the world´s oldest agpaitic complexes. It is a small (1200x400m) peralkaline nepheline-syenite in red granite, the contact zone granite being fenitic. To the north (farm Lakarp) is a second, smaller similar area.The fence between the farms is also the border of the provinces Smaland and Östegötland.

There is no quarry, just a few small outcrops and test blasts, however, it used to bequite easy to find a lot of the minerals there.

Several alkaline rocks are named for the locality: grennaite, lakarpite, kaxtorpite. Concerning the minerals there is some confusion, especially in the lavenite/rosenbuschite/hiortdahlite/mosandrite minerals. There is surely more than one, and probably one or more new ones.

Mineral list: (* means: from drill cores only, bold = type locality)
Aegirine
Albite
Analcim
Anorthite
Anorthoclase
Arfvedsonite
Barkevikite/Ferrohornblende
Biotite
Bismut*
Catapleiite (and „calciumcatapleiite“)
Chalcopyrite*
Chalcosine*
Chlorite
Copper*
Corundum
Cuprostibite*
Eckermannite
Epidote
Eudialyte
Ferroglaucophanite ?
Ferropargasite
Fluorbritholite-(Ce) (the former lessingite“, britholite-(Ce), abukumalite, tritomite now clarified)
Fluorite
Fluoroapatite
Galena (I found it in the outcrops, so it's not only in drilling cores anymore)
Glaucophanite
Goetzenite ?
Greenockite*
Hiortdahlite ?
Jinshajiangite

Karnasurtite-(Ce)

"Karnasurtite-(Y)"
Lavenite
Magnesioarfvedsonite
Magnesiohornblende
Magnesioriebeckite
Magnetite
Marialite
Microcline
Mosandrite/Rinkite ?
Muscovite
Natrolite
Nepheline

Oneillite
Pargasite
Pectolite
Polymignite ?
Prehnite
Pyrite*
Riebeckite
Quartz
Raslakite
Rinkite/Mosandrite ?
Rosenbuschite
Silver*
Sanidine
Sodalite
Sphalerite*
Thalcusite*
Thorianite
Thorite (var.Uranothorite)
Titanite
Zircon


One trip there 2 days ago (
6/1998). In the meantime nice signs describing the different outcrops and the minerals to be found there have been erected. It still was easily possible to collect eudialyte (good xx for the locality !), catapleiite in 2 habits, rosenbuschite, mosandrite, aegirine, arfvedsonite and eckermannite. Btw - the eckermannite (type !) locality is 50m W of the parking lot at the N.K. gate and easily to be seen from there - don´t try to follow Wilke´s decription (200m SW of the farmhouses). You´ll end up in a pretty swamp like I did, though it is 200m SW in fact.

1999:
Jinshajiangite has been described from Norra Kärr, occurring in a finegrained syenite (lakarpite) w/albite, nepheline, biotite, amphibole and little fluoroapatite, aegirine, titanite, magnesioarfvedsonite, and rosenbuschit, as orangered to redbrown xx of up to 5mm. (Holtstam, D., GFF; 129(1998), 373-374).
Also, there is a final (?) determination of the lessingite/britholite/tritomite-mineral from Lakarp - it is definitely fluorbritholite-(Ce). (Strand, U.: Nytt mineral för Sverige, STEIN, 26(1999), 2, 38-39)

6/2000:Nice trip in June. However, the property has been sold by Boliden AB to an undisclosed private person, and there is now a collecting fee of Skr 170 for one year (per family), to be payed to Bergslagens Geologiska Sällskap (Geol.Society of Bergslagen) in Kopparberg. Parking is changed - shortly after Kaxtorp farm. There is a locked gate on the dirt road now, and you can't reach the above mentioned parking lot anymore.
However - a lot of work has been done. The main eudialyte outcrop is nearly void of eudialyte in loose material, hard work required to get „chips“. There was a real lot of nice blue catapleiite and red catapleiite aong with some amphiboles at two other outcrops. Yes, and we found the jinshajiangite vein - a most terrible rock ! You can get only chips off, and it has obviously been vacuum cleaned for jinshajiangite.So far I have a single bad one, but there will be evenings of staring through the microscope for more. At least I have lots of magnesioarfvedsonite...

8/2005: Good news and bad news - no more collecting fee, and that is well justifird. The whole area is overgrowing, waist-high grasses and shrubs, plus lots of ticks, that can transmit borreliosis here. It is very difficult to find other outcrops than the eudailyte one close to the barn. All the nice information signs haev been destroyed. Clearly in a state of decay. Lots of jinshajiangite still in siute - with no feasible way to get them out, except with drilling and blasting.

2006: Steffen Moeckel had specimens analysed, which he allegedly found in loose rocks (I never saw loose rocks along the road nor in the grass, but well). He had them analysed in Moscow, and it turned out that the 2 new "eudialytes" oneillite and raslakite occur at NK. he also found something that would be karnasurtite-(Y), if only the original Karnasurtite-(Ce) was adequately described. Possibly there is also some fergusonite-mineral in this block. Good thing is I have some material from years ago.

6/2007: Even worse now - chest-high grass (which was wet from rain, when I walked through - drenched to the skin). Anyhow - I now have GPS-data for the outcrops. And I most likely found the oneillite and possibly also the raslakite. The oneillite definitely was not in a loose block/rock or whatever, at least not the material I found. I also tried Lakarp for the fluorbritholite-(Ce), but there is nothing left (if I found the right spot).


&Suggested reading:
H.J.Wilke: Die Mineralien und Fundstellen von Schweden, Christian-Weise-Verlag, München, 1997, 31-34 (in german) - I took newer geological and mineralogical informations from this book, and I am now trying to get the literature cited in it.

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