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Tombarthite-(Y) & Britholite-(Y)

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MCH146149

Tombarthite-(Y) & Britholite-(Y)

Radioactive

Description Tabs

Description
Locality: 
Reiersdal Pegmatite, Øvrebø, Vennesla, Agder, Norway
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 1.8 × 1.7 cm
Description

Rare minerals: A brownish mass of britholite, ca. 1.4 cm in size, and black tombarthite. This occurence is described in Griffin, W.L., Nilssen, B. & Jensen, B.B. (1979): Britholite-(Y) and its alteration: Reiarsdal Vest-Agder, south Norway. Norsk Geologisk Tidsskrift 59: 265-271.

Mineral Data
What's on the rock

Tombarthite-(Y)

Formula: 
Y4(Si,H4)4O12-x(OH)4+2x
Strunz: 
9.AD.35
Hardness: 
5.0 - 6.0
Type Locality: 
Høgetveit (Høgtveit), Evje og Hornnes, Aust-Agder, Norway

Britholite-(Y)

Formula: 
Ca2(Y,Ca)3(SiO4,PO4)3(OH,F)
Strunz: 
9.AH.25
Crystal System: 
Hexagonal
Hardness: 
5.0
Type Locality: 
Abukuma range (Abukuma massif), Fukushima prefecture, Tohoku region, Honshu Island, Japan

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