| 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. |
| Citation: |
American Mineralogist |
| Volume: |
85 |
| Issue: |
No. 9 |
| Keywords: |
actinolite;amphibole;asbestos;refractive index;tremolite;x-ray diffraction |
| Research Areas: |
Nanotechnology, Chemistry |
