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Classification of Masutomilite
|Strunz 8th edition ID:||8/H.11-60|
|Nickel-Strunz 10th (pending) edition ID:||9.EC.20|
9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.2.2b.12|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
|Hey's CIM Ref.:||16.16.11|
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Masutomilite
|Type Locality:||Tanakami-yama (Tanokami-yama), Otsu City, Shiga Prefecture, Kinki Region, Honshu Island, Japan|
|Year of Discovery:||1976|
Physical Properties of Masutomilite
Crystallography of Masutomilite
|Cell Parameters:||a = 5.26Å, b = 9.1Å, c = 10.09Å|
β = 100.83°
|Ratio:||a:b:c = 0.578 : 1 : 1.109|
|Unit Cell Volume:||V 474.37 Å³ (Calculated from Unit Cell)|
Optical Data of Masutomilite
|RI values:||nα = 1.534 nβ = 1.569 nγ = 1.570|
|2V:||Measured: 29° to 31°, Calculated: 18°|
|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 weak|
Chemical Properties of Masutomilite
|Essential elements:||Al, F, K, Li, O, Si|
|All elements listed in formula:||Al, F, H, K, Li, Mn, O, Rb, Si|
Relationship of Masutomilite 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 Masutomilite
|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 Masutomilite
Canadian Mineralogist (1998): 36: 905-912.
Mineralogical Journal (Japan) (1986): 13: 13-21.
Internet Links for Masutomilite
Localities for Masutomilite
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: Line pit (Lowe's Mine), State Line District, Cecil Co., Maryland, USAFrom Bill Cordua, 9th Dec 2013 21:28:40