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Sterlinghillite Mineral Data

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General Sterlinghillite Information

Help on Chemical  Formula: Chemical Formula: Mn++3(AsO4)2•3(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+3(AsO4)2•3(H2O)
Help on Environment: Environment: Found on loellingite-frankllinite-willemite-calcite ores. An inadequately described mineral. Only one specimen known.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Sterling Hill Mine, Ogdensburg, New Jersey, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Sterlinghillite + Pronunciation Say STERLINGHILLITE

Sterlinghillite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1032:1:1.0347
Help on Cell Dimensions: Cell Dimensions: a = 12.39, b = 11.23, c = 11.62, Z = 6; beta = 98.45° V = 1,599.25 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Monoclinic Space Group: Mono
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.209(1), 11.12(1), 2.751(0.6),

Physical Properties of Sterlinghillite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: White, Light pink.
Help on Density: Density: 2.95
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Silky - Pearly
Help on Streak: Streak: white

Optical Properties of Sterlinghillite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.656, w=1.671, bire=0.0150.

Calculated Properties of Sterlinghillite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Sterlinghillite =3.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001719031
Boson Index = 0.9998280969
Help on Photoelectric: Photoelectric: PESterlinghillite = 29.33 barns/electron
U=PESterlinghillite x rElectron Density= 85.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sterlinghillite is Not Radioactive

Sterlinghillite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.05)Ludlamite Group Ludlamite (Fe,Mg,Mn)3(PO4)2•4(H2O) P 21/a 2/m Metaswitzerite Mn3(PO4)2•4(H2O) P 2/a 2/m Sterlinghillite Mn3(AsO4)2•3(H2O) Mono Mono Switzerite (Mn,Fe)3(PO4)2•7(H2O) P 21/a 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, vol 86, p 770) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 08.CD.25





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