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 % As2 O5
Hydrogen 1.22 % H 10.88 % H2 O
Oxygen 35.43 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mn2+ 3 (AsO4 )2 •3(H2 O)
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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PESterlinghillite = 29.33 barns/electronU=PESterlinghillite x r Electron 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 � 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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