Mineralogy Database

Mcnearite Mineral Data

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General Mcnearite Information

Help on Chemical  Formula: Chemical Formula: NaCa5H4(AsO4)5•4(H2O)
Help on Composition: Composition: Molecular Weight = 994.07 gm
   Sodium     2.31 %  Na    3.12 % Na2O
   Calcium   20.16 %  Ca   28.21 % CaO
   Arsenic   37.68 %  As   57.80 % As2O5
   Hydrogen   1.22 %  H    10.87 % H2O
   Oxygen    38.63 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCa5H4(AsO4)5•4(H2O)
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Ste.-Marie-aux-Mines, Vosges Mountains, Alsace, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Elizabeth McNear, mineralogist and crystallographer, University of Geneva, Switzerland.
Help on Name Pronunciation: Name Pronunciation: Mcnearite + Pronunciation Say MCNEARITE

Mcnearite Image

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Comments: Crystalline mcnearite micro botryoids on matrix.
Location: Gabbe Gottes, Sainte-Marie-aux-Mines, Haute-Rhin, France. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mcnearite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9574:1:0.4929
Help on Cell Dimensions: Cell Dimensions: a = 13.5, b = 14.1, c = 6.95, Z = 2; alpha = 90°, beta = 92°, gamma = 119° V = 1,156.36 Den(Calc)= 2.85
Help on Crystal System: Crystal System: Triclinic Space Group: P1,P 1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.33(1), 3.122(0.6), 3.92(0.6),

Physical Properties of Mcnearite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: White.
Help on Density: Density: 2.6
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Mcnearite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.109 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1973,KPDmeas= 0.2171,KC= 0.1958
Ncalc = 1.51 - 1.56
Help on Optical Data: Optical Data: Biaxial (+), a=1.559, b=1.562, g=1.572, bire=0.0130, 2V(Calc)=58, 2V(Meas)=60.

Calculated Properties of Mcnearite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.76 gm/cc
note: Specific Gravity of Mcnearite =2.86 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0004593786
Boson Index = 0.9995406214
Help on Photoelectric: Photoelectric: PEMcnearite = 27.89 barns/electron
U=PEMcnearite x rElectron Density= 77.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mcnearite is Not Radioactive

Mcnearite Classification

Help on  Dana Class: Dana Class: (39)Hydrated Acid Phosphates, etc
  (39.03)with miscellaneous formulae
  (39.03.07)Dana Group Mcnearite NaCa5H4(AsO4)5•4(H2O) P1,P 1 Tri
Help on  Strunz Class: Strunz Class: 08.CJ.55 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CJ -With only large cations
08.CJ.55 Mcnearite NaCa5H4(AsO4)5•4(H2O) P1,P 1 Tri

Other Mcnearite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Mcnearite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.CJ.55





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