Umbite Mineral Data

General Umbite Information

Chemical Formula:

K2ZrSi3O9•(H2O)

Composition:

Molecular Weight = 415.69 gm

Potassium 18.81 % K 22.66 % K₂O

Zirconium 21.95 % Zr 29.64 % ZrO₂

Silicon 20.27 % Si 43.36 % SiO₂

Hydrogen 0.48 % H 4.33 % H₂O

Oxygen 38.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂ZrSi₃O₉•(H₂O)

Environment:

In pegmatite in a di�erentiated alkalic massif.

IMA Status:

Approved IMA 1983

Locality:

In the valley of the Vuonnemiok River, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Lake Umbozero, which separates the Khibiny massif from the Lovozero massif, Kola Peninsula, Russia.

Name Pronunciation:

Umbite

Synonym:

ICSD 39697

PDF 35-709

Umbite Image

Images:

Umbite

Comments: White, granular crystals of umbite in matrix.
Location: Koashva Mt. Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 17x15x8 mm.
© Sergey Vasiliev / Systematic Mineralogy

Umbite Crystallography

Axial Ratios:

a:b:c =0.7709:1:0.5418

Cell Dimensions:

a = 10.208, b = 13.241, c = 7.174, Z = 2; V = 969.67 Den(Calc)= 1.42

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

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

By Intensity(I/I_o): 3.02(1), 5.91(0.9), 2.87(0.8),

Physical Properties of Umbite

Cleavage:

{010} Perfect, {100} Good

Color:

Colorless, Yellowish white.

Density:

2.79

Diaphaneity:

Transparent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Umbite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -1.044 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.4331,KPDmeas= 0.2204,KC= 0.2119
Ncalc = 1.3 - 1.59

Optical Data:

Biaxial (-), a=1.596, b=1.619, g=1.63, bire=0.0340, 2V(Calc)=68, 2V(Meas)=80.

Calculated Properties of Umbite

Electron Density:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Umbite =2.79 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Umbite= 31.74 barns/electron
U=PE_Umbite x r_electron= 86.06 barns/cc.

Radioactivity:

GRapi = 263.80 (Gamma Ray American Petroleum Institute Units)
Concentration of Umbite per GRapi unit = 0.38 (%)

Estimated Radioactivity from Umbite - barely detectable

Umbite Classification

Dana Class:

59.02.01.01 (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 Umbite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Umbite :
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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Umbite

K2ZrSi3O9•(H2O)
Dana No: 59.02.01.01 Strunz No: 09.DG.25
Locality:

Notes:

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