Mcnearite Mineral Data

Mcnearite Mineral Data +

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General Mcnearite Information

Chemical Formula:

NaCa5H4(AsO4)5·4(H2O)

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

Empirical Formula:

NaCa₅H₄(AsO₄)₅·4(H₂O)

IMA Status:

Approved IMA 1981

Locality:

Ste.-Marie-aux-Mines, Vosges Mountains, Alsace, France. Link to MinDat.org Location Data.

Name Origin:

Named for Elizabeth McNear, mineralogist and crystallographer, University of Geneva, Switzerland.

Mcnearite Image

Images:

Mcnearite

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

Axial Ratios:

a:b:c =0.9574:1:0.4929

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

Crystal System:

TriclinicSpace Group: P1,P 1

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

By Intensity(I/I_o): 12.33(1), 3.122(0.6), 3.92(0.6),

Physical Properties of Mcnearite

Cleavage:

[???] Perfect

Color:

White.

Density:

2.6

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Luster:

Pearly

Streak:

white

Optical Properties of Mcnearite

Gladstone-Dale:

CI meas= -0.109 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.198,KPDmeas= 0.2171,KC= 0.1958

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

Electron Density:

r_electron=2.75 gm/cc
note: r_Mcnearite=2.85 gm/cc.

Fermion Index

Fermion Index = 0.00045
Boson Index = 0.99955

Photoelectric:

PE_Mcnearite= 27.89 barns/electron
U=PE_Mcnearite x r_electron= 76.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mcnearite is Not Radioactive

Mcnearite Classification

Dana Class:

39.3.7.1 (39)Hydrated Acid Phosphates, etc

(39.3)with miscellaneous formulae

(39.3.7)Dana Group

39.3.7.1 Mcnearite NaCa5H4(AsO4)5·4(H2O) P1,P 1 Tri

Strunz Class:

VII/C.24-20 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.24 - Haidingerite - Picropharmacolite series

VII/C.24-10 Haidingerite Ca(AsO3OH)·(H2O) Pcnb 2/m 2/m 2/m

VII/C.24-20 Mcnearite NaCa5H4(AsO4)5·4(H2O) P1,P 1 Tri

VII/C.24-30 Irhtemite Ca4Mg(AsO3OH)2(AsO4)2·4(H2O) Unk Mono

VII/C.24-40 Vladimirite Ca5(AsO3OH)2(AsO4)2·5(H2O) P 2₁/c 2/m

VII/C.24-50 Ferrarisite Ca5(AsO3OH)2(AsO4)2·9(H2O) P1 1

VII/C.24-60 Guerinite Ca5(AsO3OH)2(AsO4)2·9(H2O) P 2₁/n 2/m

VII/C.24-70 Rauenthalite Ca3(AsO4)2·10(H2O) P1 1

VII/C.24-80 Phaunouxite Ca3(AsO4)·11(H2O) P1 1

VII/C.24-90 Picropharmacolite Ca4Mg(AsO3OH)2(AsO4)2·11(H2O) P1 1

Other Mcnearite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Mcnearite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Mcnearite Specimen Label here :

Mcnearite

NaCa5H4(AsO4)5·4(H2O)
Dana No: 39.3.7.1 Strunz No: VII/C.24-20
Locality:

Notes: