{"title":"Potassium micas: a new treatment of literature data","authors":"Milan Rieder","doi":"10.1007/s00710-025-00914-4","DOIUrl":null,"url":null,"abstract":"<div><p>The present data set includes results of 1460 mica analyses, of which 1157 had passed crystal-chemical screening. Their composition was plotted in a projection pyramid alongside with eight potassium mica end-members. The biotite and zinnwaldite faces of the pyramid, together with the basal projection (from the muscovite vertex), are most informative, not only to illustrate main composition trends, but also to appreciate the distribution of dioctahedral + trioctahedral mica pairs. The two-mica subset (87 pairs, 61 of which passed crystal-chemical screening) might be promising for <i>T-p</i> applications. Physical properties are available for a limited number of micas: refractive indices <i>β</i>,<i> γ</i> (<i>N</i> = 620), mass density (<i>N</i> = 284), and unit-cell parameter <i>b</i> (<i>N</i> = 176). Corresponding regression equations were fitted as functions of orthogonal coordinates in the basal projection and offer estimates of what researchers may expect for a given mica composition.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"119 2","pages":"223 - 229"},"PeriodicalIF":1.1000,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mineralogy and Petrology","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s00710-025-00914-4","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The present data set includes results of 1460 mica analyses, of which 1157 had passed crystal-chemical screening. Their composition was plotted in a projection pyramid alongside with eight potassium mica end-members. The biotite and zinnwaldite faces of the pyramid, together with the basal projection (from the muscovite vertex), are most informative, not only to illustrate main composition trends, but also to appreciate the distribution of dioctahedral + trioctahedral mica pairs. The two-mica subset (87 pairs, 61 of which passed crystal-chemical screening) might be promising for T-p applications. Physical properties are available for a limited number of micas: refractive indices β, γ (N = 620), mass density (N = 284), and unit-cell parameter b (N = 176). Corresponding regression equations were fitted as functions of orthogonal coordinates in the basal projection and offer estimates of what researchers may expect for a given mica composition.
期刊介绍：
Mineralogy and Petrology welcomes manuscripts from the classical fields of mineralogy, igneous and metamorphic petrology, geochemistry, crystallography, as well as their applications in academic experimentation and research, materials science and engineering, for technology, industry, environment, or society. The journal strongly promotes cross-fertilization among Earth-scientific and applied materials-oriented disciplines. Purely descriptive manuscripts on regional topics will not be considered.
Mineralogy and Petrology was founded in 1872 by Gustav Tschermak as "Mineralogische und Petrographische Mittheilungen". It is one of Europe''s oldest geoscience journals. Former editors include outstanding names such as Gustav Tschermak, Friedrich Becke, Felix Machatschki, Josef Zemann, and Eugen F. Stumpfl.
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