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Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Redetermination of junitoite, CaZn(2)Si(2)O(7)·H(2)O.

Hexiong Yang¹, Neil G Jenkins, Robert T Downs

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.

The crystal structure of junitoite, a calcium dizinc disilicate monohydrate, was redetermined. This study reveals its actual space group is Aea2, differing from the previously reported Ama2.

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Area of Science:

Mineralogy
Crystallography
Geochemistry

Background:

Junitoite, CaZn(2)Si(2)O(7)·H(2)O, was initially structurally characterized by Hamilton & Finney in 1985.
The prior determination utilized space group Ama2 and yielded a reliability factor (R) of 0.10.

Purpose of the Study:

To redetermine the crystal structure of junitoite using single-crystal X-ray diffraction.
To clarify the accurate space group and structural details of this mineral.

Main Methods:

Single-crystal X-ray diffraction analysis of a natural junitoite sample.
Structure refinement and comparison with previous models.

Main Results:

The crystal structure redetermination identified the space group as Aea2, a shift from the previously assigned Ama2.
The overall framework, composed of ZnO(4) tetrahedra and Si(2)O(7) dimers, is topologically similar in both space groups.
Differences in bond lengths, particularly within the SiO(4) tetrahedra, were observed between the two models.
Calcium cations are coordinated by five oxygen atoms and a water molecule in a distorted octahedral environment.
Hydrogen bonding involves the water molecule and a framework oxygen atom.

Conclusions:

The accurate space group for junitoite is Aea2.
The revised structural parameters provide a more precise understanding of junitoite's atomic arrangement and bonding.
This redetermination refines the crystallographic data for junitoite, impacting mineralogical databases.