The crystal structure of julgoldite
- 1 September 1973
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 39 (303) , 271-281
- https://doi.org/10.1180/minmag.1973.039.303.03
Abstract
The structure of julgoldite, , has been determined and refined to an R value of 4·6 % based on 2417 symmetry-independent reflections, of which 765 are unobserved (weighted R = 4·3 %). The cell dimensions are a 8·922(4), b 6·081(3), c 19·432(9) Å, β 97·60(6)°, the space group is A2/m with Z = 4 and Dcalc 3·56 g cm-3. Julgoldite is isostructural with pumpellyite; the Si-O and Ca-O distances of julgoldite are identical, within experimental accuracy, with corresponding distances in pumpellyite; the Fe-O distances of julgoldite are about 0·09 Å longer than the corresponding (Al, Mg)-O distances in pumpellyite. The four hydroxyl groups and the extent of O-for-OH substitution are identified by valence-sum calculations.Keywords
This publication has 4 references indexed in Scilit:
- Structural relations between pumpellyite and ardenniteActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1971
- Julgoldite, the Fe+2−Fe+3 dominant pumpellyiteLithos, 1971
- On the crystal structure of pumpellyiteActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1969
- Effective ionic radii in oxides and fluoridesActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1969