Author:
Allmann Rudolf,Donnay Gabrielle
Abstract
SummaryThe 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.
Subject
Geochemistry and Petrology
Cited by
23 articles.
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1. The oxidation state and distribution of Fe in pumpellyite from the Northern Chichibu Belt in the Hijikawa district, western Shikoku, Japan;Mineralogical Magazine;2023-10-16
2. Crystal chemistry of julgoldite, a mineral series of the pumpellyite group: re-investigation of Fe distribution and hydrogen-bonding;European Journal of Mineralogy;2018-10-31
3. Crystal chemistry of poppiite, V–analogue of pumpellyite, from the Komatsu mine, Saitama Prefecture, Japan;Journal of Mineralogical and Petrological Sciences;2018
4. Lavoisierite, Mn2+ 8[Al10(Mn3+Mg)][Si11P]O44(OH)12, a new mineral from Piedmont, Italy: the link between “ardennite” and sursassite;Physics and Chemistry of Minerals;2013-02-15
5. Pumpellyite-, sursassite-, and epidote-type structures: common principles-individual features;Journal of Mineralogical and Petrological Sciences;2011