Abstract
THE simplest member of the epidote group, the calcium, aluminium end-member, has the structural formula Ca2Al.AlOH.AlO.Si2O7.SiO4 (ref. 1); common epidote forms through the replacement of part of the aluminium by ferric iron, and in the piemontites manganese is also present. The aluminium, iron and manganese end-members will be written Cz, Ps and Pm respectively. Common epidote is approximately Cz70Ps30, and piemontitos range from Cz76Ps22Pm2 to Cz40Ps13Pm47.
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STRENS, R. Synthesis and Properties of Piemontite. Nature 201, 175–176 (1964). https://doi.org/10.1038/201175a0
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DOI: https://doi.org/10.1038/201175a0
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