Notes
- ↑ "Fengite". Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. 2014-08-24. p. 514. doi:10.1007/978-3-642-41714-6_60522. ISBN 978-3-642-41713-9.
- ↑ "Websters 1913 dictionary". Archived from the original on 2010-07-23. Retrieved 2010-08-15.
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