Nepskoeite Mineral Data

Nepskoeite Mineral Data

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General Nepskoeite Information

Chemical Formula:

Mg4Cl(OH)7·6(H2O)

Composition:

Molecular Weight = 359.82 gm

Magnesium 27.02 % Mg 44.81 % MgO

Hydrogen 5.32 % H 47.56 % H₂O

Chlorine 9.85 % Cl 9.85 % Cl

- % Cl -2.22 % -O=Cl₂

Oxygen 57.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₄Cl(OH)₇·6(H₂O)

Environment:

Marine potash-bearing salt bed associated with anhydrite-halite rocks. Chemically similar to korshunovskite.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

The Asia Nepskoe salt deposit, Nepa river basin in the northern part of Lower Tunguska, Eastern Siberia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after it's location.

Synonym:

IMA1996-016

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Nepskoeite Crystallography

Axial Ratios:

a:b:c =3.5899:1:6.1491

Cell Dimensions:

a = 11.215, b = 3.124, c = 19.21, Z = 2; V = 673.03 Den(Calc)= 1.78

Crystal System:

OrthorhombicSpace Group: Pcmm,Pcm2,Pc2m

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

By Intensity(I/I_o): 3.498(1), 9.78(0.46), 9.6(0.38),

Physical Properties of Nepskoeite

Color:

Yellowish white.

Density:

1.76

Diaphaniety:

Translucent

Fracture:

Plastic - Splintery - Thin, soft flexable, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Nepskoeite

Gladstone-Dale:

CI meas= -0.11 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3101,KPDmeas= 0.3136,KC= 0.2825

Optical Data:

Biaxial (-), a=1.532, b=1.562, g=1.562, bire=0.0300, 2V(Calc)=0, 2V(Meas)=5. Dispersion weak, r < v.

Calculated Properties of Nepskoeite

Electron Density:

r_electron=1.86 gm/cc
note: r_Nepskoeite=1.78 gm/cc.

Fermion Index

Fermion Index = 0.0273
Boson Index = 0.9727

Photoelectric:

PE_Nepskoeite= 1.34 barns/electron
U=PE_Nepskoeite x r_electron= 2.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nepskoeite is Not Radioactive

Nepskoeite Classification

Dana Class:

6.4.11.1 (6)Hydroxides and Oxides Containing Hydroxyl

(6.4)containing multiple cations

(6.4.11)Dana Group

6.4.11.1 Nepskoeite ! Mg4Cl(OH)7·6(H2O) Pcmm,Pcm2,Pc2m Ortho

Strunz Class:

III/D.01-12 III - Halogenides

III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn

III/D.01 - Atacamite series, Korshunovskite - Anthonyite

III/D.01-10 Korshunovskite Mg2Cl(OH)3·3.5-4(H2O) P1 or P1 Tri

III/D.01-12 Nepskoeite Mg4Cl(OH)7·6(H2O) Pcmm,Pcm2,Pc2m Ortho

III/D.01-15 Hibbingite (Fe,Mg)2(OH)3Cl Pnam 2/m 2/m 2/m

III/D.01-20 Kempite Mn2Cl(OH)3 Pnam 2/m 2/m 2/m

III/D.01-25 Belloite! Cu(OH)Cl P 2₁/a 2/m

III/D.01-30 Atacamite Cu2Cl(OH)3 Pmcn 2/m 2/m 2/m

III/D.01-40 Clinoatacamite! Cu2(OH)3Cl P 2₁/n 2/m

III/D.01-50 Botallackite Cu2Cl(OH)3 P 2₁/m 2/m

III/D.01-55 Paratacamite (Cu,Zn)2(OH)3Cl R 3 3

III/D.01-57 Herbertsmithite! Cu3Zn(OH)6Cl2 R 3m 3 2/m

III/D.01-60 Melanothallite Cu2OCl2 F ddd 2/m 2/m 2/m

III/D.01-65 Bobkingite! Cu5Cl2(OH)8(H2O)2 C 2/m 2/m

III/D.01-70 Calumetite Cu(OH,Cl)2·2(H2O) Unk Ortho

III/D.01-80 Anthonyite Cu(OH,Cl)2·3(H2O) Unk. Mono

Other Nepskoeite Information

References:

NAME( MinRec) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Nepskoeite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Nepskoeite

Mg4Cl(OH)7·6(H2O)
Dana No: 6.4.11.1 Strunz No: III/D.01-12
Locality:

Notes: