General Milarite Information
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Chemical Formula: |
K2Ca4Al2Be4Si24O60·(H2O) |
Composition: |
Molecular Weight = 1,980.55 gm |
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Potassium 3.95 % K 4.76 % K2O |
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Calcium 8.09 % Ca 11.33 % CaO |
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Beryllium 1.82 % Be 5.05 % BeO |
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Aluminum 2.72 % Al 5.15 % Al2O3 |
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Silicon 34.03 % Si 72.81 % SiO2 |
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Hydrogen 0.10 % H 0.91 % H2O |
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Oxygen 49.28 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
K2Ca4Al2Be4(Si24O60)·(H2O) |
Environment: |
Granitic pegmatites. |
IMA Status: |
Valid Species (Pre-IMA) 1870 |
Locality: |
Val Milar, Switzerland. Link to MinDat.org Location Data. |
Name Origin: |
Named after its locality. |
Synonym: |
ICSD 6260 |
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PDF 35-459 |
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Milarite Image |
Images:
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Images:
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Milarite
Comments: Blocky, barrel-shaped crystal of milarite on muscovite..
Location: Jagauaracu, Minas Gerais, Brazil.
Scale: Crystal size 2.5 x 1 x 1 cm.
© Rob Lavinsky |
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Milarite Crystallography
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Axial Ratios: |
a:c = 1:1.32997 |
Cell Dimensions: |
a = 10.41, c = 13.845, Z = 1; V = 1,299.35 Den(Calc)= 2.53 |
Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc |
X Ray Diffraction: |
By Intensity(I/Io): 3.307(1), 2.88(0.9), 4.16(0.65), |
Crystal Structure:
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drag2 - RMB Resize/Rotate
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Help on Above
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Hawthorne F C , Kimata M , Cerny P , Ball N A , Rossman G R , Grice J D , American Mineralogist , 76 (1991) p.1836-1856, The crystal chemistry of the milarite-group minerals, sample #25 from Guanajuato, Note: U(1,2) of WatB/NaB changed to match symmetry constraints
View Additional jPOWD Structure files for Milarite
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[10]
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Physical Properties of Milarite
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Cleavage: |
[0001] Imperfect, [1120] Imperfect |
Color: |
Colorless, White, Greenish white, Yellowish white. |
Density: |
2.52 |
Diaphaniety: |
Transparent to translucent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Crystalline - Coarse - Occurs as well-formed coarse sized crystals. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
6 - Orthoclase |
Luminescence: |
Fluorescent. |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Milarite
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Dichroism (e): |
colorless. |
Dichroism (w): |
colorless. |
Gladstone-Dale: |
CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2124,KPDmeas= 0.2132,KC= 0.2104 |
Optical Data: |
Uniaxial (-), e=1.529-1.548, w=1.532-1.551, bire=0.0030-0.0160. |
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Calculated Properties of Milarite
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Electron Density: |
relectron=2.52 gm/cc note: rMilarite =2.53 gm/cc. |
Fermion Index |
Fermion Index = 0.03444 Boson Index = 0.96556 |
Photoelectric: |
PEMilarite = 2.79 barns/electron U=PEMilarite x relectron= 7.04 barns/cc. |
Radioactivity: |
GRapi = 56.71 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Milarite - barely detectable
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Milarite Classification
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Dana Class: |
63.2.1a.12 (63)Cyclosilicate Condensed Rings |
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(63.2)Milarite - Osumilite type (6x2) Double Rings |
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(63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup) |
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63.2.1a.1 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.2 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.3 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.2.1a.4 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.5 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.6 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.7 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.8 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.9 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m |
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63.2.1a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.12 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m |
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63.2.1a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m |
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63.2.1a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m |
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63.2.1a.16 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m |
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63.2.1a.18 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m |
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63.2.1a.19 IMA2003-045a! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m |
Strunz Class: |
VIII/E.22-20 VIII - Silicates |
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VIII/E - Cyklosilicates, double six rings [Si12O30]12- |
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VIII/E.22 - Millarite - Osumilite series |
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VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-22 Almarudite! K([],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30] P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 63/mmc 6/m 2/m 2/m |
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VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m |
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VIII/E.22-80 Osumilite-(Mg) (K,Na)(Mg,Fe)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-90 Osumilite-(Fe) (K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m |
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VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m |
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VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-133 Shibkovite! K(Ca,Mn,Na)2(K2-x,[]x)2ZnSi12O30(x~0.8) P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m |
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VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2 |
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Other Milarite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Milarite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Applied Mineralogy
6 -Athena
7 - EUROmin Project
8 -Google Images
9 -Google Scholar
10 -Handbook of Mineralogy (MinSocAm)
11 -Handbook of Mineralogy (UofA)
12 -MinDAT
13 -MinMax(Deutsch)
14 -MinMax(English)
15 -Mineralienatlas (Deutsch)
16 -QUT Mineral Atlas
17 - WWW-MINCRYST
18 -École des Mines de Paris
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Milarite
K2Ca4Al2Be4Si24O60·(H2O)
Dana No: 63.2.1a.12 Strunz No: VIII/E.22-20
Locality:
Notes:
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