Hiortdahlite from Jingera, New South Wales
- 1 January 1979
- journal article
- research article
- Published by Taylor & Francis in Journal of the Geological Society of Australia
- Vol. 26 (1) , 81-85
- https://doi.org/10.1080/00167617908729069
Abstract
Hiortdahlite from a fine‐grained phonolite dyke in the Jingera Rock Syenite Complex, N.S.W. is triclinic Pl or Pi, a = 11.011 Å, b = 10.922 Å, c = 7.343 Å, α = 109.32°, β = 110.02°, γ = 83.49°. The unit cell contains (Ca8.38 Na4.10 Mn0.50 Zr2.27 Nb0.31 Ti0.05 Fe0.21 Y0.14) [Si8O28] (O1.58(OH)1.12 F5.30); S.G. = 3.309. The crystals are biaxial +ve, 2V = 86°, α = 1.658, β = 1.664, γ = 1.671, γ:z(100) = 35°, α:z(010) = 14.5°. Polysynthetic normal twinning on (010) is present in all crystals. Type material from Langesund Fjord, Norway has been re‐investigated and found to have very similar properties, but is twinned on (100).Keywords
This publication has 1 reference indexed in Scilit:
- On the identity of Guarinite and HiortdahliteMineralogical Magazine and Journal of the Mineralogical Society, 1909