Norsk versjon
THE INDUSTRIAL MINERAL DATABASE
Occurence 3014 - 302 Ås
(Object Id: 8880)
(Last updated: 27.04.2007)

Location
County: Viken Municipality: Indre Østfold (3014)
Map 1:50000: Askim (1914-2) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 625218 m. North: 6601142 m.
Longitude: 11.2138930 Latitude: 59.5298770
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Resource
Resource Type: Feldspar Resource Subtype: Pegmatitic feldspar

Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Mineral Amount
Albite Major mineral (>90%)
Potassic feldspar Major mineral (50-90%)

Information(s) in free text format
Free text
Forekomsten beskrives å ligge 200 meter SØ for gården Ås, 3 km VNV for Eidsberg kirke. Her er det beskrevet et lite dagbrudd drevet på en 6 meter mektig pegmatitt som er intrudert i amfibolitt. Pegmatitten er sonert med albitt- skriftgranitt langs grensene og en sentral sone med opptil 1.5 meter store stolper av alkalifeltspat. Gangen kan følges i en lengde av 50 meter. Forekomsten var i prøvedrift i 1932.

Bibliography:
From NGU's Reference Archive:
Broch, Olaf Anton , 1934
Feltspat IV. Forekomster i Akershus og Østfold øst for Glomma.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.141;1-119 pages
Abstract:
In this publication, which is a sequel to Feltspat II and III by Olaf Andersen and Tom F.W. Barth, brief and exoteric descriptions and some information on production and history are given of about 180 individual feldspar, quartz, and mica deposits, all of them situated east of the river Glomma in south-eastern Norway. Particulars of purely geological or mineralogical interest are few; most of them are given as footnotes or in the preface, but the minerals of each deposit, exceot quartz, feldspar and mica, are listed. The deposits are cross cutting pegmatite dikes, with a northeastern strike and a steep dip. The dikes exhibit a marked zoning; moreover, they are remarkably free from rare minerals, the occurrences of which seems to be restricted almost entirely to the dikes near the Idefjord (Bohus) granite.


The fact sheet was created on 26.10.2021

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