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Milarite

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Formula:
K2Ca4Al2Be4Si24O60 · H2O
System:
Hexagonal
Hardness:
6
Member of:
Name:
Named by Kenngott (1870) for the Val Milà, Grischun, Switzerland, where the material of his first description was erroneously said to come from.
May be confused with beryl and apatite.

Visit gemdat.org for gemological information about Milarite.

Classification of Milarite

Approved, 'Grandfathered' (first described prior to 1959)
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.12

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
16.6.5

16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
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Type Occurrence of Milarite

Physical Properties of Milarite

Hardness (Mohs):
6

Crystallography of Milarite

Crystal System:
Hexagonal
Cell Parameters:
a = 10.42Å, c = 13.8Å
Ratio:
a:c = 1 : 1.324
Unit Cell Volume:
V 1,297.61 ų (Calculated from Unit Cell)

Crystallographic forms of Milarite

Crystal Atlas:
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Milarite no.2 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Optical Data of Milarite

Type:
Uniaxial (-)
RI values:
nω = 1.532 - 1.551 nε = 1.529 - 1.548
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Milarite

Formula:
K2Ca4Al2Be4Si24O60 · H2O
All elements listed in formula:
Common Impurities:
Na

Relationship of Milarite to other Species

Member of:
Other Members of Group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
ArmeniteBaCa2Al6Si9O30 · 2H2O
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
EifeliteKNa3Mg4Si12O30
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30
Klöchite(□Na)KFe22+Zn3(Si12O30)
Merrihueite(K,Na)2(Fe,Mg)5Si12O30
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Osumilite-(Mg)KMg2Al3(Al2Si10)O30
PoudretteiteKNa2B3Si12O30
Roedderite(Na,K)2(Mg,Fe)5Si12O30
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05SugiliteK(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
16.6.1BerylBe3Al2(Si6O18)
16.6.2EuclaseBeAl(SiO4)(OH)
16.6.3BaveniteCa4Be2Al2Si9O26(OH)2
16.6.4AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)
16.6.6LovdariteK2Na6Be4Si14O36 · 9H2O
16.6.7Surinamite(Mg,Fe)3Al4BeSi3O16
16.6.8Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8

Other Names for Milarite

Name in Other Languages:
German:Milarit
Simplified Chinese:铍钙大隅石
Spanish:Milarita
Traditional Chinese:鈹鈣大隅石

Other Information

Health Risks:
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

Reference List:
Kenngott, A. (1870) Mittheilungen an Professor G. Leonhard. Neues Jahrbuch für Mineralogie, Geologie und Paläontologie: 1870: 80-81.

Goßner, B., Mußgnug, F. (1930) Über Alstonit und Milarit. Centralblatt für Mineralogie, Geologie und Paläontologie: 1930: 220-238.

Palache, C. (1931) On the presence of beryllium in milarite. American Mineralogist: 16: 469-470.

Černý, P., Hawthorne, F.C., Jarosewich, E. (1980) Crystal chemistry of milarite. The Canadian Mineralogist: 18: 52.

Hawthorne, F.C., Kimata, M., Cerny, P., Ball, N., Rossman, G.R, Grice, J.D. (1991) The crystal chemistry of the milarite-group minerals. American Mineralogist: 76: 1836.

Armbruster, T., Bermanec, V., Wenger, M., Oberhansli, R. (1989) Crystal chemistry of double-ring silicates: Structure of natural and dehydrated milarite at 100 K. European Journal of Mineralogy: 1: 353-362.

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

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.
Mineral and/or Locality  
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