Nepskoeite Mineral Data

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

Nepskoeite Image

Images:

Nepskoeite

Comments: Cream-colored nodules of nepskoeite recovered from potash ore preserved in glass tube 1.5 cm long.
Location: Nepskoe Deposit, Irkutsk District, Siberia, Russia. Scale: Nodule Size 0.1 mm.
© Diederik Visser

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:

Orthorhombic Space 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

Diaphaneity:

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
Ncalc = 1.5

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:

Bulk Density (Electron Density)=1.86 gm/cc
note: Specific Gravity of Nepskoeite =1.78 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Nepskoeite= 1.34 barns/electron
U=PE_Nepskoeite x rElectron Density= 2.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nepskoeite is Not Radioactive

Nepskoeite Classification

Dana Class:

06.04.11.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.04)containing multiple cations

(06.04.11)Dana Group

06.04.11.01 Nepskoeite! Mg4Cl(OH)7•6(H2O) Pcmm,Pcm2,Pc2m Ortho

Strunz Class:

03.BD.20 03 - HALIDES

03.B - Simple Halides, with H2O

03.BD -Simple Halides with H2O and additional OH

03.BD.20 Nepskoeite! Mg4Cl(OH)7•6(H2O) Pcmm,Pcm2,Pc2m Ortho

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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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

Nepskoeite

Mg4Cl(OH)7•6(H2O)
Dana No: 06.04.11.01 Strunz No: 03.BD.20
Locality:

Notes:

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