Fact Sheet for <b>Occurence 4211

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 4211 - 314 Mostad
	(Object Id: 8363) (Last updated: 13.01.2023)

Location

County:

Agder

Municipality:

Gjerstad (4211)

Map 1:50000:

Gjerstad (1612-1)

Map 1:250000:

Arendal

Coordinate system:

EU89-UTM Zone 32

(Coordinates NOT confirmed)

East:

500218 m.

North:

6527491 m.

Longitude:

9.0037860

Latitude:

58.8871980

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Resource

Resource Type:

Feldspar

Resource Subtype:

Pegmatitic feldspar

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Mineralization

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Stratigraphic classification of host rock

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Information(s) in free text format

Free text

Mineraler fra denne pegmatittkroppen er beskrevet hos Sverdrup et al (1979), Pegmatittkkroppen er beskrevet som 7 bred med strøk 153 N og fall 60 grader Ø og strekker seg fra myrlengdt terreng i sørøst til skogkledd terreng.

Bibliography:

From NGU's Reference Archive:

Sverdrup, Thor L.; Bryn, Knut Ørn; Sæbø, Per Chr. , 1959

Contributions to the mineralogy of Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.39 (2/3);237-247 pages

Abstract:

Frie emneord: Bastnäsite Optical and X-ray powder data are given for bastnäsite from four localities in Norway. The indices of refraction and the birefringences are lower than those reported earlier. The crystallographic constants are in close agreement with the previously published values, except in one case where the mineral shows smaller a0 and c0 values. The variation in the unit cell and the optical properties are discussed, but lack of chemical data prevents any conclusive explanation. Bastnäsite has been found as a secondary mineral, mostly as an alteration product of allanite. The mineral seems to be more widespread than supposed earlier especially in pegmatites containing altered allanite.

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