Grumantite Mineral Data

General Grumantite Information

Chemical Formula:

NaHSi2O5•(H2O)

Composition:

Molecular Weight = 178.18 gm

Sodium 12.90 % Na 17.39 % Na₂O

Silicon 31.52 % Si 67.44 % SiO₂

Hydrogen 1.70 % H 15.17 % H₂O

Oxygen 53.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaHSi₂O₅•(H₂O)

Environment:

Found as fine-grained compact veins with ussingite margins.

IMA Status:

Approved IMA 1987

Locality:

Mt. Alluaiev, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named from the old Russian name for the Spitzbergen Archipelago, Arctic Ocean.

Name Pronunciation:

Grumantite + Pronunciation

Synonym:

ICSD 39749

PDF 42-1331

Grumantite Crystallography

Axial Ratios:

a:b:c =0.8755:1:0.3923

Cell Dimensions:

a = 15.979, b = 18.25, c = 7.16, Z = 16; V = 2,087.98 Den(Calc)= 2.27

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: F dd2

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

By Intensity(I/I_o): 3.006(1), 3.505(1), 6.2(1),

Physical Properties of Grumantite

Cleavage:

{110} Perfect

Color:

White, Snow white.

Density:

2.21

Diaphaneity:

Transparent to Translucent

Habit:

Compact - Occurs as a compact mass.

Hardness:

4-5 - Fluorite-Apatite

Luminescence:

Fluorescent, Short UV=weak bluish white.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Grumantite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2238,KPDmeas= 0.2299,KC= 0.2249
Ncalc = 1.5 - 1.51

Optical Data:

Biaxial (+), a=1.494, b=1.507, g=1.523, bire=0.0290, 2V(Calc)=86, 2V(Meas)=85. Dispersion weak, r > v.

Calculated Properties of Grumantite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Grumantite =2.27 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Grumantite= 1.45 barns/electron
U=PE_Grumantite x rElectron Density= 3.32 barns/cc.

Radioactivity:

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

Grumantite Classification

Dana Class:

78.04.05.01 (78)Unclassified silicates

(78.04)possible inosilicates

(78.04.05)Dana Group

78.04.05.01 Grumantite NaHSi2O5•(H2O) F dd2 mm2

Strunz Class:

09.EH.10 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EH -Transitional structures between phyllosilicate and other silicate units

09.EH.10 Grumantite NaHSi2O5•(H2O) F dd2 mm2

Other Grumantite Information

References:

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

See Also:

Links to other databases for Grumantite :
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
15 - WWW-MINCRYST

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

Grumantite

NaHSi2O5•(H2O)
Dana No: 78.04.05.01 Strunz No: 09.EH.10
Locality:

Notes:

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