Preiswerkite Mineral Data

Preiswerkite Mineral Data +

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General Preiswerkite Information

Chemical Formula:

NaMg2Al3Si2O10(OH)2

Composition:

Molecular Weight = 402.72 gm

Sodium 5.71 % Na 7.69 % Na₂O

Magnesium 12.07 % Mg 20.02 % MgO

Aluminum 20.10 % Al 37.98 % Al₂O₃

Silicon 13.95 % Si 29.84 % SiO₂

Hydrogen 0.50 % H 4.47 % H₂O

Oxygen 47.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMg₂Al₃Si₂O₁₀(OH)₂

IMA Status:

Approved IMA 1980

Locality:

Link to MinDat.org Location Data.

Preiswerkite Image

Images:

Preiswerkite

Comments: Pale green fine grained preiswerkite masses in dark amphibolite rock.
Location: Geisspfad, Binnental, Valias, Switzerland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Preiswerkite Crystallography

Axial Ratios:

a:b:c =0.5777:1:1.085

Cell Dimensions:

a = 5.228, b = 9.049, c = 9.819, Z = 2; beta = 100.42° V = 456.86 Den(Calc)= 2.93

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 1.503(1), 2.572(1), 2.457(0.7),

Crystal Structure:

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Oberti R , Ungaretti L , Tlili A , Smith D C , Robert J-L , American Mineralogist , 78 (1993) p.1290-1298, The crystal structure of preiswerkite, Sample: KP9

View Additional jPOWD Structure files for Preiswerkite
[1]

Physical Properties of Preiswerkite

Cleavage:

[001] Perfect

Color:

Greenish white, Light green.

Density:

2.96

Diaphaniety:

Transparent to Translucent

Hardness:

2.5 - Finger Nail

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Preiswerkite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.033 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2035,KPDmeas= 0.2015,KC= 0.2105

Optical Data:

Biaxial (-), a=1.56, b=1.614, g=1.615, bire=0.0550, 2V(Calc)=14, 2V(Meas)=5-7.

Calculated Properties of Preiswerkite

Electron Density:

r_electron=2.91 gm/cc
note: r_Preiswerkite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.01881
Boson Index = 0.98119

Photoelectric:

PE_Preiswerkite= 1.49 barns/electron
U=PE_Preiswerkite x r_electron= 4.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Preiswerkite is Not Radioactive

Preiswerkite Classification

Dana Class:

71.2.2b.15 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2b)Mica Group (Biotite subgroup)

71.2.2b.1 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

71.2.2b.1a Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

71.2.2b.1b Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

71.2.2b.2 Biotite* K(Mg,Fe)3[AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

71.2.2b.3a Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

71.2.2b.4 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

71.2.2b.5 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

71.2.2b.5a Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

71.2.2b.6 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

71.2.2b.7 Lepidolite K(Li,Al)3(Si,Al)4O10(F,OH)2 C 2/m,Cm Mono

71.2.2b.8 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

71.2.2b.8a Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

71.2.2b.8b Sokolovaite! CsLi2AlSi4O10F2 C 2/m, C 2 or Cm Mono

71.2.2b.9 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

71.2.2b.10 Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

71.2.2b.11 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

71.2.2b.12 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

71.2.2b.13 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

71.2.2b.14 Wonesite (Na,K).5(Mg,Fe,Al)3(Si,Al)4O10(OH,F)2 C 2/m 2/m

71.2.2b.15 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

71.2.2b.16 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

71.2.2b.17 IMA2004-049! NaMg3(AlSi3)O10(OH)2 C 2/m 2/m

Strunz Class:

VIII/H.11-140 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.11 - Mica group, Biotite series

VIII/H.11-00* Zinnwaldite KLiFeAl(AlSi3)O10(F,OH)2 C 2/m 2/m

VIII/H.11-10 Polylithionite KLi2AlSi4O10(F,OH)2 C 2/m 2/m

VIII/H.11-20 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

VIII/H.11-30 Norrishite K(Mn2Li)Si4O10(O)2 C 2/m 2/m

VIII/H.11-35 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

VIII/H.11-40 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

VIII/H.11-50 Trilithionite! KLi1.5Al1.5AlSi3O10F2 C 2/m 2/m

VIII/H.11-60 Masutomilite K(Li,Al,Mn)3[(Si,Al)4O10](F,OH)2 C 2/m 2/m

VIII/H.11-70 Aspidolite NaMg3AlSi3O10(OH)2 C 2/m 2/m

VIII/H.11-80 Phlogopite KMg3(Si3Al)O10(F,OH)2 C 2/m 2/m

VIII/H.11-90 Tetra-ferriphlogopite! KMg3FeSi3O10(OH)2 2/m

VIII/H.11-100 Hendricksite K(Zn,Mg,Mn)3Si3AlO10(OH)2 C 2/m 2/m

VIII/H.11-102 Shirozulite! KMn3(AlSi3)O10(OH,F)2 C 2/m 2/m

VIII/H.11-105 Fluorannite! KFe3AlSi3O10F2 C 2/m 2/m

VIII/H.11-110 Annite KFe3AlSi3O10(OH,F)2 C 2/m 2/m

VIII/H.11-120 Tetra-ferri-annite K(Fe,Mg)3(Fe,Al)Si3O10(OH)2 C 2/m 2/m

VIII/H.11-130 Ephesite NaLiAl2(Al2Si2)O10(OH)2 C 2/c 2/m

VIII/H.11-140 Preiswerkite NaMg2Al3Si2O10(OH)2 C 2/m 2/m

VIII/H.11-150 Eastonite! KMg2Al[Al2Si2O10](OH)2 2/m

VIII/H.11-160 Siderophyllite KFe2Al(Al2Si2)O10(F,OH)2 C 2/m 2/m

Other Preiswerkite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Preiswerkite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Preiswerkite Specimen Label here :

Preiswerkite

NaMg2Al3Si2O10(OH)2
Dana No: 71.2.2b.15 Strunz No: VIII/H.11-140
Locality:

Notes: