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|System:||Monoclinic||Colour:||White, greenish yellow, ...|
|Name:||Named for Ada Swineford (1917-1993), clay mineralogist and professor of geology at Western Washington State College, Bellingham, Washington, USA.|
Classification of Swinefordite
|IMA status:||Approved 1973|
|Strunz 8th edition ID:||8/H.19-60|
|Nickel-Strunz 10th (pending) edition ID:||9.EC.45|
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.3.1a.5|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
3 : Sheets of 6-membered rings with 2:1 clays
|Hey's CIM Ref.:||16.1.8|
16 : Silicates Containing Aluminum and other Metals
1 : Aluminosilicates of Li
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Type Occurrence of Swinefordite
|Type Locality:||Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA|
|Year of Discovery:||1973|
Physical Properties of Swinefordite
|Colour:||White, greenish yellow, dark olive-gray|
Crystallography of Swinefordite
|Cell Parameters:||a = 5.2Å, b = 9Å, c = 13Å|
|Ratio:||a:b:c = 0.578 : 1 : 1.444|
|Unit Cell Volume:||V 0.00 Å³ (Calculated from Unit Cell)|
Optical Data of Swinefordite
|RI values:||nα = 1.492 nβ = 1.524 nγ = 1.526|
|2V:||Measured: 29° to 45°, Calculated: 26°|
|Maximum Birefringence:||δ = 0.034|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v strong|
Chemical Properties of Swinefordite
|Essential elements:||Al, H, Li, O, Si|
|All elements listed in formula:||Al, F, H, Li, Mg, O, Si|
Relationship of Swinefordite to other Species
|Member of:||Smectite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Swinefordite
|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 Swinefordite
American Mineralogist (1975): 60: 540-547.
Internet Links for Swinefordite
Localities for Swinefordite
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.