- Oct 13, 2017
- Pennantite
- IMA Ideal Chemistry changed from "(Mn2+,Al)6(Si,Al)4O10(OH)8" to "Mn2+5Al(Si3Al)O10(OH)8"
- Jan 5, 2013
- May 27, 2007
- Pennantite
- RRUFF Ideal Chemistry changed from "Mn2+5Al(Si3Al)O10(OH)8" to "(Mn2+,Al)6(Si,Al)4O10(OH)8"
- Apr 10, 2007
- Pennantite
- IMA Ideal Chemistry changed to "(Mn2+,Al)6(Si,Al)4O10(OH)8"
- May 10, 2006
- Pennantite
- RRUFF Ideal Chemistry changed from "Mn5Al(Si3Al)O10(OH)8" to "Mn2+5Al(Si3Al)O10(OH)8"
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