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Hellandite-(Y)

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ALP143422

Hellandite-(Y)

Description Tabs

Description
Locality: 
Luserna Quarries, San Giovanni, Torino Province, Piedmont, Italy
Size Range: 
Miniature (4.5-7 cm)
Size: 
2 × 2.5 × 4.5 cm
Description

Groups prismatic colorless crystals of rare alpine hellandite-(Y) in grey-green leucogranitic orthogneiss

Mineral Data
What's on the rock

Hellandite-(Y)

Formula: 
(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2
Strunz: 
9.DK.20
Crystal System: 
Monoclinic
Hardness: 
5.5
Type Locality: 
Lindvikskollen quarry, Lindvikskollen-Kalstadgangen pegmatite, Kragerø, Telemark, Norway

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