Lawsonbauerite Mineral Data

Lawsonbauerite Mineral Data +

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General Lawsonbauerite Information

Chemical Formula:

(Mn,Mg)9Zn4(SO4)2(OH)22·8(H2O)

Composition:

Molecular Weight = 1,398.82 gm

Magnesium 6.95 % Mg 11.53 % MgO

Manganese 23.56 % Mn 30.43 % MnO

Zinc 18.70 % Zn 23.27 % ZnO

Hydrogen 2.74 % H 24.47 % H₂O

Sulfur 4.58 % S 11.45 % SO₃

Oxygen 43.46 % O

______ ______

100.00 % 101.14 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₆Mg₄Zn₄(SO₄)₂(OH)₂₂·8(H₂O)

IMA Status:

Approved IMA 1979

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 31188

PDF 33-873

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Lawsonbauerite Crystallography

Axial Ratios:

a:b:c =1.0892:1:1.7022

Cell Dimensions:

a = 10.5, b = 9.64, c = 16.41, Z = 2; beta = 95.21° V = 1,654.16 Den(Calc)= 2.81

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 10.457(1), 3.876(0.48), 2.768(0.36),

Crystal Structure:

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Treiman A H , Peacor D R , American Mineralogist , 67 (1982) p.1029-1034, The crystal structure of lawsonbauerite, (Mn,Mg)9Zn4(SO4)2(OH)22.8H2O,, and its relation to mooreite

Physical Properties of Lawsonbauerite

Cleavage:

None

Color:

Colorless, White.

Density:

2.87

Diaphaniety:

Transparent to Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Streak:

white

Optical Properties of Lawsonbauerite

Gladstone-Dale:

CI meas= 0.059 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.039 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2146,KPDmeas= 0.2101,KC= 0.2232

Optical Data:

Biaxial (-), a=1.59, b=1.608, g=1.611, bire=0.0210, 2V(Calc)=44, 2V(Meas)=42.

Calculated Properties of Lawsonbauerite

Electron Density:

r_electron=2.78 gm/cc
note: r_{Lawsonbauerite}=2.81 gm/cc.

Fermion Index

Fermion Index = 0.01517
Boson Index = 0.98483

Photoelectric:

PE_{Lawsonbauerite}= 15.43 barns/electron
U=PE_{Lawsonbauerite} x r_electron= 42.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lawsonbauerite is Not Radioactive

Lawsonbauerite Classification

Dana Class:

31.1.4.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.1)where (A+ B++)m (XO4)p Zq·x(H2O), where m:p>6:1

(31.1.4)Dana Group

31.1.4.1 Torreyite (Mg,Mn)9Zn4(SO4)2(OH)22·8(H2O) P 2₁/a 2/m

31.1.4.2 Lawsonbauerite (Mn,Mg)9Zn4(SO4)2(OH)22·8(H2O) P 2₁/c 2/m

Strunz Class:

VI/D.04-30 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.04 - Mooreite - Hauckite series

VI/D.04-10 Mooreite (Mg,Zn,Mn)15(SO4)2(OH)26·8(H2O) P 2₁/a 2/m

VI/D.04-20 Torreyite (Mg,Mn)9Zn4(SO4)2(OH)22·8(H2O) P 2₁/a 2/m

VI/D.04-30 Lawsonbauerite (Mn,Mg)9Zn4(SO4)2(OH)22·8(H2O) P 2₁/c 2/m

VI/D.04-50 Hauckite (Mg,Mn)24Zn18Fe3(SO4)4(CO3)2(OH)81(?) P 6/mmm 6/m 2/m 2/m

Other Lawsonbauerite 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 Lawsonbauerite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Lawsonbauerite

(Mn,Mg)9Zn4(SO4)2(OH)22·8(H2O)
Dana No: 31.1.4.2 Strunz No: VI/D.04-30
Locality:

Notes: