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|System:||Monoclinic||Colour:||Colourless, pale yellow|
|Name:||Named in 1843 by Karl Emil Schafhäutl from the Greek, παραγειυ to mislead as the mineral looked like talc, but did not contain Mg.|
An uncommon Na-member of the mica group.
Classification of Paragonite
|Strunz 8th edition ID:||8/H.10-50|
|Nickel-Strunz 10th (pending) edition ID:||9.EC.15|
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.2.2a.2|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
|Hey's CIM Ref.:||16.2.4|
16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na
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Type Occurrence of Paragonite
|Type Locality:||Sponda Alp - Pizzo Forno, Chironico Valley, Leventina, Ticino (Tessin), Switzerland|
Physical Properties of Paragonite
|Colour:||Colourless, pale yellow|
Crystallography of Paragonite
Optical Data of Paragonite
|RI values:||nα = 1.564 - 1.580 nβ = 1.594 - 1.609 nγ = 1.600 - 1.609|
|Maximum Birefringence:||δ = 0.036|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v strong|
Chemical Properties of Paragonite
|Simplified for copy/paste:||NaAl2(AlSi3O10)(OH)2|
|Essential elements:||Al, H, Na, O, Si|
|All elements listed in formula:||Al, H, Na, O, Si|
Relationship of Paragonite to other Species
|Series:||Forms a series with Muscovite (see here)|
|Member of:||Mica Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Paragonite
Polytypes for Paragonite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Paragonite
Schaller, Waldemar Theodore & Rollin Elbert Stevens (1941), The validity of paragonite as a mineral species: American Mineralogist: 26: 541-545.
American Mineralogist (1984): 69: 122-127.
European Journal of Mineralogy (1992): 4: 283.
Canadian Mineralogist (1998): 36: 905-912.
Internet Links for Paragonite
Localities for Paragonite
The 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.