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Open AccessArticle

Slatecalculation—A Practical Tool for Deriving Norm Minerals in the Lowest-Grade Metamorphic Pelites and Roof Slates

1
Lehrstuhl für Geologie, Universität Trier, Im Nettetal 4, D 56727 Mayen, Germany
2
Mineralogisch-Petrographisches Institut Universität Hamburg, Grindelallee 48, D 20146 Hamburg, Germany
3
Lehrstuhl für Geologie, Universität Trier, Behringstrasse 21, D 54296 Trier, Germany
4
Institute of Geography, Kiel University, D 24118 Kiel, Germany
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(5), 395; https://doi.org/10.3390/min10050395
Received: 3 March 2020 / Revised: 24 April 2020 / Accepted: 26 April 2020 / Published: 29 April 2020
(This article belongs to the Special Issue Minerals and Other Phases in Constructional Geomaterials)
Roof and wall slates are fine-grained rocks with slaty cleavage, and it is often difficult to determine their mineral composition. A new norm mineral calculation called slatecalculation allows the determination of a virtual mineral composition based on full chemical analysis, including the amounts of carbon dioxide (CO2), carbon (C), and sulfur (S). Derived norm minerals include feldspars, carbonates, micas, hydro-micas, chlorites, ore-minerals, and quartz. The mineral components of the slate are assessed with superior accuracy compared to the petrographic analysis based on the European Standard EN 12326. The inevitable methodical inaccuracies in the calculations are limited and transparent. In the present paper, slates, shales, and phyllites from worldwide occurrences were examined. This also gives an overview of the rocks used for discontinuous roofing and external cladding. View Full-Text
Keywords: mineralogy; roof slates; shales; phyllites; norm mineral calculation; hydro-micas; illite mineralogy; roof slates; shales; phyllites; norm mineral calculation; hydro-micas; illite
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Wagner, H.W.; Jung, D.; Wagner, J.-F.; Wagner, M.P. Slatecalculation—A Practical Tool for Deriving Norm Minerals in the Lowest-Grade Metamorphic Pelites and Roof Slates. Minerals 2020, 10, 395.

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