Overntjern Quarry, Snarum, Modum, Buskerud, Norway

A serpentine-magnesite deposite quarried for magnesite and serpentine.
References:
- Jøsang, Ottar (1966): Geologiske og petrologiske undersøkelser i Modumfeltet. Norges Geologiske Undersøkelse nr 235, 91-97
- Rømming, C.& Raade, G.(1980): The crystal structure of Althausite. American Mineralogist, 65, 488-498
- Raade, G.(1999): Et unikt mineralselskap av magnesiumfosfater fra magnesitt-serpentin-forekomster på Modum. Bergverksmuseets Skrift nr 15,10-14 [in norwegian]
- Witsø, T. (1994): Sjelden dolomitt fra Overntjern. STEIN 21 (3), 193

Mineral List:

	Althausite (TL)

	'Apatite'

	Clinochlore var: Leuchtenbergite

	Collinsite

	Dolomite

	Enstatite

	Magnesite

	Phosphoellenbergerite

	'Serpentine Group'

	Talc

10 entries listed. 7 valid minerals. 1 type locality (valid mineral).

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