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NIST Authors in Bold
|Author(s):||Jennifer R. Verkouteren; A G. Wylie;|
|Title:||The Tremolite-Actinolite-Ferro-Actinolite Series: Systematic Relationships Among Cell Parameters Composition, Optical Properties, and Habit and Evidence of Discontinuities|
|Published:||September 01, 2000|
|Abstract:||The cell parameters, optical properties and chemical composition of 103 samples in the tremolite-actinolite-ferro-actinolite series have been measured. The combination of properties and the large number of samples provided a powerful means of determining systematic relationships in the series. The cell parameters and refractive indices for end members tremolite and ferro-actinolite were determined by regressions of the data. Natural tremolite is not systematically enriched in cummingtonite and/or depleted in Ca. The substitution of Al for Si involves, on average, a tschermakite component. Samples characterized as asbestos have lower Al concentrations than massive or byssolite samples. There is a discontinuity in [alpha] between 10% & 12% ferro-actinolite. There are also indications of discontinuities in optical properties and [-] between 26% and 32% ferro-actinolite that may be due to an increase in tschermakite substitution.|
|Keywords:||actinolite,amphibole,asbestos,refractive index,tremolite,x-ray diffraction|
|Research Areas:||Chemistry, Nanotechnology|