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Illite-2M

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Formula:
K0.65Al2.0[Al0.65Si3.35O10](OH)2
A polytype of 'Illite'


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Unique IdentifiersHide

Mindat ID:
31648
Long-form identifier:
mindat:1:1:31648:4

Chemistry of Illite-2MHide

Mindat Formula:
K0.65Al2.0[Al0.65Si3.35O10](OH)2
Element Weights:
Element% weight
O38.526 %
Si37.465 %
Al23.995 %
H0.014 %
K0.000 %

Calculated from ideal end-member formula.
O
Si
Al
H
K
Elements listed:
Al, H, K, O, Si - search for minerals with similar chemistry

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Illite-2M associated with 'Black shale'
2 photos of Illite-2M associated with 'Organic-rich-sediment'
2 photos of Illite-2M associated with SphaleriteZnS
2 photos of Illite-2M associated with 'Glendonite'CaCO3
2 photos of Illite-2M associated with IkaiteCaCO3 · 6H2O
2 photos of Illite-2M associated with CalciteCaCO3

RadioactivityHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Illite-2MHide

References for Illite-2MHide

Reference List:

Localities for Illite-2MHide

Showing 5 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Japan
 
  • Saga Prefecture
    • Nishimatsuura District
      • Arita
Kuwahara et al. (2008)
  • Shimane Prefecture
    • Unnan City
- (n.d.)
Norway
 
  • Akershus
    • BÃĶrum (Baerum)
      • Lommedalen
Berg (1989)
Romania
 
  • Caraş-Severin County
    • Locva Mountains (Locvei Mountains)
Dumitraş et al. (2025)
USA
 
  • Colorado
    • San Juan County
USGS Prof. Paper 750C +1 other reference
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