Paraumbite Mineral Data

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General Paraumbite Information

Chemical Formula:

K3Zr2HSi6O18•n(H2O) n=3 to 7

Composition:

Molecular Weight = 811.30 gm

Potassium 14.46 % K 17.42 % K₂O

Zirconium 22.49 % Zr 30.38 % ZrO₂

Silicon 20.77 % Si 44.44 % SiO₂

Hydrogen 0.87 % H 7.77 % H₂O

Oxygen 41.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Zr₂HSi₆O₁₈•3(H₂O)

Environment:

Alkalic pegmatites.

IMA Status:

Approved IMA 1983

Locality:

Mt. Eveslogchorr, eastern Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the close structural similarity to umbite.

Name Pronunciation:

Paraumbite + Pronunciation

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Paraumbite Crystallography

Axial Ratios:

a:b:c =0.778:1:1.0948

Cell Dimensions:

a = 10.34, b = 13.29, c = 14.55, Z = 4; V = 1,999.44 Den(Calc)= 2.69

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 5.95(1), 3.01(0.9), 6.46(0.8),

Physical Properties of Paraumbite

Cleavage:

{010} Perfect, {100} Good

Color:

Colorless, White, Light yellow.

Density:

2.59

Diaphaneity:

Transparent to Translucent

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Paraumbite

Gladstone-Dale:

CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2229,KPDmeas= 0.2315,KC= 0.2171
Ncalc = 1.56 - 1.58

Optical Data:

Biaxial (-), a=1.588, b=1.601, g=1.61, bire=0.0220, 2V(Calc)=78, 2V(Meas)=82.

Calculated Properties of Paraumbite

Electron Density:

Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Paraumbite =2.69 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Paraumbite= 31.91 barns/electron
U=PE_Paraumbite x r_electron= 83.78 barns/cc.

Radioactivity:

GRapi = 203.66 (Gamma Ray American Petroleum Institute Units)
Concentration of Paraumbite per GRapi unit = 0.49 (%)

Estimated Radioactivity from Paraumbite - barely detectable

Paraumbite Classification

Dana Class:

59.02.01.02 (59)Cyclosilicate Three-Membered Rings

(59.02)hydrated

(59.02.01)Umbite and related species

59.02.01.01 Umbite K2ZrSi3O9•(H2O) P 2₁2₁2₁ 2 2 2

59.02.01.02 Paraumbite K3Zr2HSi6O18•n(H2O)n=3to7 Unk Ortho

59.02.01.03 Kostylevite K2ZrSi3O9•(H2O) P 2₁/a 2/m

Strunz Class:

09.DG.25 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DG -Inosilicates with 3-periodic single and multiple chains

09.DG.25 Paraumbite K3Zr2HSi6O18•n(H2O)n=3to7 Unk Ortho

09.DG.25 Umbite K2ZrSi3O9•(H2O) P 2₁2₁2₁ 2 2 2

Other Paraumbite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Paraumbite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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

Paraumbite

K3Zr2HSi6O18•n(H2O) n=3 to 7
Dana No: 59.02.01.02 Strunz No: 09.DG.25
Locality:

Notes: