Lawsonbauerite Mineral Data

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)

Environment:

Secondary mineral formed in a metamorphosed stratiform zinc orebody.

IMA Status:

Approved IMA 1979

Locality:

Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Lawson H. Bauer (1889-1954), American chemist, New Jersey Zinc Company, Franklin, New Jersey, USA.

Name Pronunciation:

Lawsonbauerite + Pronunciation

Synonym:

ICSD 31188

PDF 33-873

Lawsonbauerite Image

Images:

Lawsonbauerite

Comments: Brown, bladed coating of lawsonbauerite crystals on white calcite.
Location: Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Scale: Specimen Size 8 x 7 x 4 cm.
© Rob Lavinsky

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 - Prismatic H-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),

Physical Properties of Lawsonbauerite

Cleavage:

None

Color:

Colorless, White.

Density:

2.87

Diaphaneity:

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
Ncalc = 1.63 - 1.64

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:

Bulk Density (Electron Density)=2.78 gm/cc
note: Specific Gravity of Lawsonbauerite =2.81 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lawsonbauerite is Not Radioactive

Lawsonbauerite Classification

Dana Class:

31.01.04.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.01)where (A+ B++)m (XO4)p Zqï¿½x(H2O), where m:p>6:1

(31.01.04)Dana Group

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

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

Strunz Class:

07.DD.40 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.40 Lawsonbauerite (Mn,Mg)9Zn4(SO4)2(OH)22•8(H2O) P 2₁/c 2/m

07.DD.40 Torreyite (Mg,Mn)9Zn4(SO4)2(OH)22•8(H2O) P 2₁/a 2/m

Other Lawsonbauerite Information

References:

NAME( AntBidBlaNic5) 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 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Lawsonbauerite

(Mn,Mg)9Zn4(SO4)2(OH)22•8(H2O)
Dana No: 31.01.04.02 Strunz No: 07.DD.40
Locality:

Notes:

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