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Visit gemdat.org for gemological information about Milarite. Currently in public beta-test.
Classification of Milarite
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
|Strunz 8th edition ID:||8/E.22-20|
|Nickel-Strunz 10th (pending) edition ID:||9.CM.05|
9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
|Dana 8th edition ID:||63.2.1a.12|
63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
|Hey's CIM Ref.:||16.6.5|
16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
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Type Occurrence of Milarite
|Type Locality:||Giuv Valley, Tujetsch (Tavetsch), Vorderrhein Valley, Grischun (Grisons; Graubünden), Switzerland|
|Year of Discovery:||1870|
Physical Properties of Milarite
Crystallography of Milarite
|Cell Parameters:||a = 10.42Å, c = 13.8Å|
|Ratio:||a:c = 1 : 1.324|
|Unit Cell Volume:||V 1,297.61 Å³ (Calculated from Unit Cell)|
About Crystal AtlasYou may need to scroll this box using your mouse to view the full instructions.
The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java
The 3d models and java code are kindly provided by www.smorf.nl. You can control the movement of the models by holding down the left mouse-button over the 3d model and moving your mouse. Keyboard controls are:
Optical Data of Milarite
|RI values:||nω = 1.532 - 1.551 nε = 1.529 - 1.548|
|Maximum Birefringence:||δ = 0.003|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Chemical Properties of Milarite
|Essential elements:||Al, Be, Ca, H, K, O, Si|
|All elements listed in formula:||Al, Be, Ca, H, K, O, Si|
Relationship of Milarite to other Species
|Member of:||Osumilite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Milarite
|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 Milarite
Canadian Mineralogist (1980): 18: 52.
American Mineralogist (1991): 76: 1836.
Nysten, P. (1996) Paragenetic setting and crystal chemistry of milarites from Proterozoic granitic pegmatites in Sweden. Neues Jahrbuch für Mineralogie, Monatshefte 1996, 564-576.
Internet Links for Milarite
|Specimens:||The following Milarite specimens are currently listed for sale on minfind.com.|
Localities for Milarite
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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