File:Nepheline, Albite, Cancrinite-462814.jpg

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Deutsch: Nephelin, Albit, Cancrinit
Fundort: Dennis Hill (Litchfield-Sodalith-Fundort), Litchfield, Kennebec County, Maine, USA
Beschreibung: Ein 2 cm großes, poliertes Stück Nephelin und Albit aus Litchfield-Nephelin-Syenit-Pluton. Der Albit befindet sich auf der linken Seite und enthält kleine Biotitsplitter und einen winzigen Fleck blassgelben Cancrinits. Der Nephelin befindet sich rechts und ist ein großer, wohlgeformter Kristall. Die horizontalen grünen Streifen im Nephelin sind extrem dünne Biotitkristalle, die im Gefüge des Nephelins wuchsen, als er kristallisierte. Dies stammt aus einer stark porphyritischen Phase des Syenits, in der die Nephelinkristalle zuerst wuchsen (und ziemlich groß waren) und später von einem „Schlamm“ aus Albit als Grundmasse umgeben wurden. Nephelin ist im Litchfield-Syenit irre schwer, gut zu fotografieren, weil er normalerweise nicht gut geformt ist; Meistens ist er nur ein ungefähr rechteckiger „Blob“ aus grünlich gräulichem Zeug, das vor allem anderen verwittert. Oh ... und niemals Nephelin oder Litchfieldit in die Nähe von Oxalsäure bringen. Es löst sich auf. Wenn Sie das Gefühl haben, dass Sie ein stark verschmutztes Exemplar reinigen müssen, verwenden Sie ein 1:20 mit Wasser gemischtes Bleichmittel.
English: Nepheline, Albite, Cancrinite
Locality: Dennis Hill locality (Litchfield sodalite locality), Litchfield, Kennebec County, Maine, USA
Description: A 2 cm polished chunk of nepheline and albite from Litchfield nepheline syenite pluton. The albite is on the left, containing small slivers of biotite and a tiny patch of pale yellow cancrinite. The nepheline is on the right and is one large, well formed crystal. The horizontal green laths in the nepheline are extremely thin crystals of biotite which grew within the fabric of the nepheline as it crystallized. This is from a highly porphrytic phase of the syenite, wherein the nepheline crystals grew first (and quite large) and were later surrounded by a 'slush' of albite as the ground mass. Nepheline is ridiculously hard to photograph well in the Litchfield syenite because it is usually not well formed; most often it's just a roughly rectangular 'blob' of greenish greyish stuff that weathers out before everything else. Oh ... and don't ever put nepheline or litchfieldite anywhere near oxalic acid. It dissolves. If you feel you have to clean a very soil-stained specimen, use bleach mixed 1:20 with water.
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Source https://www.mindat.org/photo-462814.html (Mindat-ID PAE-9PV)
Author Douglas Watts

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This file is licensed under the Creative Commons Attribution 3.0 Unported license.
Attribution: Douglas Watts
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current19:13, 18 February 2022Thumbnail for version as of 19:13, 18 February 20221,131 × 931 (1.34 MB)Ra'ike (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{de|1= Nephelin, Albit, Cancrinit ::Fundort: Dennis Hill (Litchfield-Sodalith-Fundort), Litchfield, Kennebec County, Maine, USA ::Beschreibung: Ein 2 cm großes, poliertes Stück Nephelin und Albit aus Litchfield-Nephelin-Syenit-Pluton. Der Albit befindet sich auf der linken Seite und enthält kleine Biotitsplitter und einen winzigen Fleck blassgelben Cancrinits. Der Nephelin befindet sich recht...

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