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While externally similar shapes, these two minerals are very different inside.
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Illite from
Apollo Mine, Raubach, Puderbach, Neuwied, Rhineland-Palatinate, Germany


Locality type:Mine
Classification
Species:Muscovite var: Illite
Formula:K0.65Al2.0[Al0.65Si3.35O10](OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Illite data
Locality Data:Click here to view Apollo Mine, Raubach, Puderbach, Neuwied, Rhineland-Palatinate, Germany
Data Identifiers
Mindat Occurrence Record ID:77362
Long-form Identifier:1:3:77362:9
GUID (UUID V4):0
Nearest other occurrences of Illite
29.9km (18.6 miles) ⓘFriedrichssegen Mine, Friedrichssegen, Lahnstein, Rhein-Lahn-Kreis, Rhineland-Palatinate, Germany
36.3km (22.6 miles) ⓘSchöne Aussicht Mine, Burbach, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
37.3km (23.2 miles) ⓘEisenzecher Zug mine, Eiserfeld, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
41.5km (25.8 miles) ⓘPrinz Friedrich mine, Obersdorf, Wilnsdorf, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
43.3km (26.9 miles) ⓘFriedericke mine, Siegen, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
53.4km (33.2 miles) ⓘWildermann Mine, Ferndorf, Kreuztal, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany
89.4km (55.5 miles) ⓘHardtkopf, Hellefeld, Sundern, Hochsauerlandkreis, Arnsberg, North Rhine-Westphalia, Germany
References
 
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