Almarudite Mineral Data

Almarudite Mineral Data

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General Almarudite Information

Chemical Formula:

K([ ],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30]

Composition:

Molecular Weight = 1,000.32 gm

Potassium 3.36 % K 4.05 % K₂O

Sodium 0.48 % Na 0.65 % Na₂O

Calcium 0.08 % Ca 0.11 % CaO

Magnesium 0.92 % Mg 1.53 % MgO

Manganese 5.66 % Mn 7.30 % MnO

Beryllium 1.86 % Be 5.18 % BeO

Aluminum 2.16 % Al 4.08 % Al₂O₃

Zinc 0.20 % Zn 0.24 % ZnO

Iron 3.46 % Fe 4.45 % FeO

Silicon 33.83 % Si 72.38 % SiO₂

Oxygen 47.98 % O

______ ______

100.00 % 99.98 % = TOTAL OXIDE

Empirical Formula:

K_0.86Na_0.21Mn²⁺_1.03Fe²⁺_0.62Mg_0.38Zn_0.03Ca_0.02Be_2.07Al_0.8Si_12.05O₃₀

Environment:

In xenoliths in leucite tephrite lava. Milarite group; structure determined.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

A quarry at the Bellerberg volcano lava field, near Ettringen, 2 km north of Mayen, Laacher See region, eastern Eifel area, Germany. Link to MinDat.org Location Data.

Name Origin:

After the authors’ hosting and supporting institution, "Universität Wien", and is derived from the university’s proper name "ALma MAter RUDolphina".

Synonym:

IMA2002-048

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Almarudite Crystallography

Axial Ratios:

a:c = 1:1.40942

Cell Dimensions:

a = 9.997, c = 14.09, Z = 2; V = 1,219.50 Den(Calc)= 2.72

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mcc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.882(1)(300), 3.187(0.9)(211), 4.076(0.8)(112),2.732(0.5)(204), 3.522(0.4)(004), 1.826(0.4)(315), 5(0.4)(110), 7.047(0.4)(002),

Physical Properties of Almarudite

Cleavage:

None

Color:

Yellow, Orange.

Diaphaniety:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Streak:

light orange

Optical Properties of Almarudite

Gladstone-Dale:

CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2057,KC= 0.207

Optical Data:

Uniaxial (-), e=1.559, w=1.56, bire=0.0010.

Calculated Properties of Almarudite

Electron Density:

r_electron=2.69 gm/cc
note: r_Almarudite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.03642
Boson Index = 0.96358

Photoelectric:

PE_Almarudite= 4.29 barns/electron
U=PE_Almarudite x r_electron= 11.53 barns/cc.

Radioactivity:

GRapi = 47.90 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Almarudite - barely detectable

Almarudite Classification

Dana Class:

63.2.1a.18 (63)Cyclosilicate Condensed Rings

(63.2)Milarite - Osumilite type (6x2) Double Rings

(63.2.1a)Milarite - Osumilite group (Milarite - Osumilite subgroup)

63.2.1a.1 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.2 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

63.2.1a.3 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

63.2.1a.4 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.5 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

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

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

63.2.1a.8 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.9 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.10 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

63.2.1a.11 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

63.2.1a.12 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m

63.2.1a.13 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

63.2.1a.14 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

63.2.1a.15 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

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

63.2.1a.17 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

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

63.2.1a.19 IMA2003-045a! (Sc,Ca)2KBe3Si12O30 P 6/mmc 6/m 2/m 2/m

Strunz Class:

VIII/E.22-22 VIII - Silicates

VIII/E - Cyklosilicates, double six rings [Si12O30]12-

VIII/E.22 - Millarite - Osumilite series

VIII/E.22-10 Poudretteite KNa2B3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-20 Milarite K2Ca4Al2Be4Si24O60·(H2O) P 6/mcc 6/m 2/m 2/m

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

VIII/E.22-25 Trattnerite! (Fe,Mg)2(Mg,Fe)3(Si12O30) P 6/mcc 6/m 2/m 2/m

VIII/E.22-30 Eifelite KNa3Mg4Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-40 Roedderite (Na,K)2(Mg,Fe)5Si12O30 P 6₃/mmc 6/m 2/m 2/m

VIII/E.22-50 Chayesite K(Mg,Fe)4Fe(Si12O30) P 6/mcc 6/m 2/m 2/m

VIII/E.22-60 Merrihueite (K,Na)2(Fe,Mg)5Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-70 Yagiite (Na,K)3Mg4(Al,Mg)6(Si,Al)24O60 P 6/mmc 6/m 2/m 2/m

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

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

VIII/E.22-100 Emeleusite Na4Li2Fe2Si12O30 Pnna 2/m 2/m 2/m

VIII/E.22-110 Sugilite KNa2(Fe,Mn,Al)2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-120 Sogdianite (K,Na)2(Li,Fe,Al)3ZrSi12O30 P 6/mmm 6/m 2/m 2/m

VIII/E.22-125 Berezanskite! KLi3Ti2Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-130 Darapiosite KNa2Zr[Li(Mn,Zr)2Si12O30] P 6/mcc 6/m 2/m 2/m

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

VIII/E.22-135 Dusmatovite K(K,Na,[])(Mn,Y,Zr)2(Zn,Li)3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-140 Brannockite KSn2Li3Si12O30 P 6/mcc 6/m 2/m 2/m

VIII/E.22-150 Armenite BaCa2Al6Si9O30·2(H2O) Pnc2 mm2

Other Almarudite Information

References:

NAME( CanMin, 42:1241) PHYS. PROP.(CanMin, 42:1241) OPTIC PROP.(CanMin, 42:1241)

See Also:

Links to other databases for Almarudite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Almarudite

K([ ],Na)2(Mn,Fe,Mg)2(Be,Al)3[Si12O30]
Dana No: 63.2.1a.18 Strunz No: VIII/E.22-22
Locality:

Notes: