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|Name:||Named in 1823 by Johann Nepomuk von Fuchs. The earlier name (1820), by Friedrich Mohs, for this mineral was "pearl-mica", because of its luster.|
Hintze (Vol. 2, 1897) gives Sterzing (Vipiteno), South Tyrol as the TL of margarite and refers to Mohs (1820). In fact, Mohs described the mineral, but did not provide an analysis. Therefore, according to von Zepharovich (1873), Greiner Mt. has to be regarded as the TL, based on the data provided by Senger.
Classification of Margarite
|Strunz 8th edition ID:||8/H.12-40|
|Nickel-Strunz 10th (pending) edition ID:||9.EC.30|
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.2.2c.1|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
|Hey's CIM Ref.:||16.9.13|
16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca
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Type Occurrence of Margarite
|Type Locality:||Großer Greiner, Zemmgrund, Zillertal, North Tyrol, Tyrol, Austria|
|Year of Discovery:||1820|
Physical Properties of Margarite
Crystallography of Margarite
|Cell Parameters:||a = 5.11Å, b = 8.79Å, c = 19.15Å|
β = 95.15°
|Ratio:||a:b:c = 0.581 : 1 : 2.179|
|Unit Cell Volume:||V 856.69 Å³ (Calculated from Unit Cell)|
Optical Data of Margarite
|RI values:||nα = 1.595 - 1.638 nβ = 1.625 - 1.648 nγ = 1.627 - 1.650|
|2V:||Measured: 26° to 67°, Calculated: 28° to 46°|
|Maximum Birefringence:||δ = 0.032|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v|
Chemical Properties of Margarite
|Simplified for copy/paste:||CaAl2(Al2Si2O10)(OH)2|
|Essential elements:||Al, Ca, H, O, Si|
|All elements listed in formula:||Al, Ca, H, O, Si|
Relationship of Margarite to other Species
|Member of:||Mica Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Margarite
|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 Margarite
Senger, W. (1821), "Oryctographie der Gefürsteten Grafschaft Tirols", Wagner (Innsbruck), 1821, pp. 32-33.
Canadian Mineralogist (1998): 36: 905-912.
Internet Links for Margarite
|Specimens:||The following Margarite specimens are currently listed for sale on minfind.com.|
Localities for Margarite
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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Wheal Devonshire, St Agnes, St Agnes District, Cornwall, England, UKFrom Peter Haas, 30th Aug 2014 00:20:03