Sterlinghillite Mineral Data

Sterlinghillite Mineral Data +

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General Sterlinghillite Information

Chemical Formula:

Mn++3(AsO4)2·3(H2O)

Composition:

Molecular Weight = 496.70 gm

Manganese 33.18 % Mn 42.85 % MnO

Arsenic 30.17 % As 46.27 % As₂O₅

Hydrogen 1.22 % H 10.88 % H₂O

Oxygen 35.43 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃(AsO₄)₂·3(H₂O)

Environment:

Found on loellingite-frankllinite-willemite-calcite ores. An inadequately described mineral. Only one specimen known.

IMA Status:

Approved IMA 1981

Locality:

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

Name Origin:

Named for the locality.

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Sterlinghillite Crystallography

Axial Ratios:

a:b:c =1.1032:1:1.0347

Cell Dimensions:

a = 12.39, b = 11.23, c = 11.62, Z = 6; beta = 98.45° V = 1,599.25 Den(Calc)= 3.09

Crystal System:

MonoclinicSpace Group: Mono

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

By Intensity(I/I_o): 3.209(1), 11.12(1), 2.751(0.6),

Physical Properties of Sterlinghillite

Cleavage:

[???] Perfect

Color:

White, Light pink.

Density:

2.95

Habit:

Spherical - Spherical, rounded aggregates.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luster:

Silky - Pearly

Streak:

white

Optical Properties of Sterlinghillite

Gladstone-Dale:

CI meas= -0.145 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.094 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2147,KPDmeas= 0.2249,KC= 0.1964

Optical Data:

Uniaxial (-), e=1.656, w=1.671, bire=0.0150.

Calculated Properties of Sterlinghillite

Electron Density:

r_electron=2.92 gm/cc
note: r_{Sterlinghillite}=3.09 gm/cc.

Fermion Index

Fermion Index = 0.00017
Boson Index = 0.99983

Photoelectric:

PE_{Sterlinghillite}= 29.33 barns/electron
U=PE_{Sterlinghillite} x r_electron= 85.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sterlinghillite is Not Radioactive

Sterlinghillite Classification

Dana Class:

40.3.5.3 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.5)Dana Group

40.3.5.1 Ludlamite (Fe,Mg,Mn)3(PO4)2·4(H2O) P 2₁/a 2/m

40.3.5.2 Metaswitzerite Mn3(PO4)2·4(H2O) P 2/a 2/m

40.3.5.3 Sterlinghillite Mn3(AsO4)2·3(H2O) Mono Mono

40.3.5.4 Switzerite (Mn,Fe)3(PO4)2·7(H2O) P 2₁/a 2/m

Strunz Class:

VII/C.05-30 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.05 - Kaatialaite - Sterlinghillite series

VII/C.05-10 Kaatialaite Fe[H2AsO4]3·5-5.5(H2O) P 2₁,P 2₁/m Mono

VII/C.05-20 Krautite MnAsO3(OH)2·(H2O) P 2₁ 2

VII/C.05-30 Sterlinghillite Mn3(AsO4)2·3(H2O) Mono Mono

Other Sterlinghillite Information

References:

NAME( Dana8) PHYS. PROP.(AmMin, vol 86, p 770) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Sterlinghillite :
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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Print or Cut-and-Paste your Sterlinghillite Specimen Label here :

Sterlinghillite

Mn++3(AsO4)2·3(H2O)
Dana No: 40.3.5.3 Strunz No: VII/C.05-30
Locality:

Notes: