An intergrowth of scandiobabingtonite and cascandite from the Heftetjern granite pegmatite, Norway

Authors
Raade, G Erambert, M
Citation
G. Raade et M. Erambert, An intergrowth of scandiobabingtonite and cascandite from the Heftetjern granite pegmatite, Norway, N J MINER M, (12), 1999, pp. 545-550
Citations number
8
Categorie Soggetti
Earth Sciences
Journal title
NEUES JAHRBUCH FUR MINERALOGIE-MONATSHEFTE
ISSN journal
00283649 → ACNP
Issue
12
Year of publication
1999
Pages
545 - 550
Database
ISI
SICI code
0028-3649(199912):12<545:AIOSAC>2.0.ZU;2-Y
Abstract
Backscatter images reveal an intergrowth of the two pyroxenoid minerals sca ndiobabingtonite and cascandite in separate areas exceeding 100 mu m in len gth. Formation of the two minerals appears to be co-eval. The empirical for mula of scandiobabingtonite is Ca-1.94(Fe0.742+Mn0.23Mg0.03)(Sigma 1.00)(Sc 0.93Fe0.053+)(Sigma 0.98)Si5.06O14(OH) and that of cascandite is Ca-1.00(Sc 0.81Fe0.182+Mn0.04Mg0.01)(Sigma 1.04)Si3.03O8(OH). Compositions between the two extremes would seem to indicate areas with numerous chain periodicity faults.