Faktarka for Forekomstområde 911

					English version
	INDUSTRIMINERALDATABASEN
	Forekomstområde 911 - 314
	(Sist oppdatert 13.jan.2023)

Navn på deposit area : Mostad

(Objekt Id : 0911,314,00,00)

Lokalisering

Fylke :

Aust-Agder (09)

Kommune :

Gjerstad (0911)

Kart 1:50000:

Gjerstad (1612-1)

Kart 1:250000:

Arendal

Markeringspunkt:

Lengdegrad:

9.0037860

Breddegrad:

58.8871980

EU89-UTM Zone 32

(Coordinates NOT confirmed)

X-koord:

500218 m.

Y-koord:

6527491 m.

Materialtype

Hovedtype:

Feltspat

Subtype:

Pegmatittisk feltspat

Betydning

Offentlig: Not Assessed (reg. 18.02.2015)

Economical: Ikke vurdert

Products

Element/product Crude ore grade or quality

PEGFEL %

Mineralization

Era: Period:

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Plunge:

Stratigraphic classification of host rock

Era: Period:

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Igneous complex:

Group: Formation:

Opplysning(er) i fritekstformat

Fri tekst

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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