A Review of the Classification of Opal with Reference to Recent New Localities
Abstract
Our examination of over 230 worldwide opal samples shows that X-ray diffraction (XRD) remains the best primary method for delineation and classification of opal-A, opal-CT and opal-C, though we found that mid-range infra-red spectroscopy provides an acceptable alternative. Raman, infra-red and nuclear magnetic resonance spectroscopy may also provide additional information to assist in classification and provenance. The corpus of results...
Paper Details
Title
A Review of the Classification of Opal with Reference to Recent New Localities
Published Date
May 15, 2019
Journal
Volume
9
Issue
5
Pages
299 - 299
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