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Redetermination of clinobaryl-ite, BaBe(2)Si(2)O(7).

Adrien J Di Domizio¹, Robert T Downs, Hexiong Yang

¹Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, Arizona 85721-0077, USA.

Acta Crystallographica. Section E, Structure Reports Online

|November 6, 2012

Summary

This summary is machine-generated.

Clinobaryl-ite, a barium diberyllium disilicate mineral, was re-examined using single-crystal X-ray diffraction. This study refines understanding of its crystal structure and bonding within the sorosilicate framework.

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Area of Science:

Mineralogy
Crystallography
Geochemistry

Background:

Clinobaryl-ite (BaBe2Si2O7) is a sorosilicate mineral dimorphic with barylite.
It belongs to the BaM(2+)2Si2O7 group, with natural occurrences of Be-, Fe-, and Cu-members.
Previous structural data for clinobaryl-ite exists from Krivovichev et al. (2004).

Purpose of the Study:

To re-examine the crystal structure of clinobaryl-ite using modern single-crystal X-ray diffraction.
To provide a detailed description of the atomic arrangement and bonding in clinobaryl-ite.
To compare the refined structural parameters with previous findings.

Main Methods:

Single-crystal X-ray diffraction data collection from a natural clinobaryl-ite sample.
Structure refinement and analysis.
Comparison of bond lengths and angles with prior studies.

Main Results:

The crystal structure of clinobaryl-ite was determined based on new X-ray diffraction data.
The structure features a framework of BeO4 and SiO4 tetrahedra linked by corner-sharing and Si2O7 units.
Barium cations are located in channels within the framework, coordinated by eleven oxygen atoms.
Key bond lengths and angles within the Si2O7 unit show significant differences compared to previous studies.

Conclusions:

The re-examination provides an updated and refined understanding of the clinobaryl-ite crystal structure.
The detailed structural analysis highlights specific differences in bonding parameters compared to earlier work.
This study contributes to the knowledge of sorosilicate mineral structures and their variations.