- Série des plagioclases

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Structured data parsed from Wikipedia. Série des plagioclases La composition d'un feldspath plagioclase est généralement précisée par sa fraction globale d'anorthite (% An), ou par son complément à 100 %, qui est sa fraction d'albite (% Ab). Elle est facilement déterminée en mesurant l’indice de réfraction d'un grain cristal du plagioclase, ou l’angle d'extinction d’un individu en lame mince de roches avec un microscope polarisant. En effet, ces deux paramètres optiques, parmi d'autres, varient continûment et de manière monotone en fonction de, par exemple, la fraction albitique (% Ab). Plusieurs noms de minéraux ont été définis par gammes selon la valeur de cette fraction albitique. Le tableau suivant présente ces noms et les gammes associées de compositions, en termes de pourcentages anorthitique et albitique. angle d'extinction

Data Source : WIKIPEDIA
Number of Data columns : 3 Number of Data rows : 6
Categories : economy, demography, politics, knowledge

Dataset

Data row number Nom % NaAlSi3O8 (% Ab) % CaAl2Si2O8 (% An)

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Data Columns

Name Description Data Type
Nom text
% NaAlSi3O8 (% Ab) text
% CaAl2Si2O8 (% An) text

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