Sterlinghillite Mineral Data

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.

Name Pronunciation:

Sterlinghillite + Pronunciation

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:

Monoclinic Space 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
Ncalc = 1.58 - 1.61

Optical Data:

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

Calculated Properties of Sterlinghillite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Sterlinghillite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.0001719031
Boson Index = 0.9998280969

Photoelectric:

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

Radioactivity:

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

Sterlinghillite Classification

Dana Class:

40.03.05.03 (40)Hydrated Phosphates, etc

(40.03)where (A++)3 (XO4)2 ï¿½ x(H2O)

(40.03.05)Ludlamite Group

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

40.03.05.02 Metaswitzerite Mn3(PO4)2•4(H2O) P 2/a 2/m

40.03.05.03 Sterlinghillite Mn3(AsO4)2•3(H2O) Mono Mono

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

Strunz Class:

08.CD.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CD -With only medium-sized cations, RO4:H2O = 1:2

08.CD.25 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 - 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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Print or Cut-and-Paste your Sterlinghillite Specimen Label here :

Sterlinghillite

Mn++3(AsO4)2•3(H2O)
Dana No: 40.03.05.03 Strunz No: 08.CD.25
Locality:

Notes:

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