English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The crystal structure of datolite, CaBSi04 (OH), has been refined by the method of least squares with allowance for anisotropic vibrations using ITO and MaRl's (1953) three-dimensional data. Refinement to an R of 12.8% with 525 reflections has led to the mean dimensions: Si-O(br) = 1.668 ::i 0.007, Si-O(per) = 1.563 ::i 0.012 A and Si-O(br)-B = 1250; bond lengths in the boron tetrahedra vary from 1.449 ::i 0.022 to 1.561 ::i 0.027 A. The Ca'" 0 links playa significant role in the structure. The Pauling-Zachariasen method of the balancing of valences gives an excellent qualitative description of the variations in the Si-O, B-O and Ca'" 0 lengths. n bonding may be the mechanism for the variations in the Si-O lengths. The structures of herderite, CaBeP04F which is isotypic with datolite, and gadolinite are also discussed on the basis of the balancing of valences.

A reconsideration of the structure of datolite, CaBSiO 4 (OH)