Mineralogy Database

Umbite Mineral Data

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General Umbite Information

Help on Chemical  Formula: Chemical Formula: K2ZrSi3O9•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2ZrSi3O9•(H2O)
Help on Environment: Environment: In pegmatite in a di´┐Żerentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: In the valley of the Vuonnemiok River, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lake Umbozero, which separates the Khibiny massif from the Lovozero massif, Kola Peninsula, Russia.
Help on Name Pronunciation: Name Pronunciation: Umbite Say UMBITE
Help on Synonym: Synonym: ICSD 39697
  PDF 35-709

Umbite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.7709:1:0.5418
Help on Cell Dimensions: Cell Dimensions: a = 10.208, b = 13.241, c = 7.174, Z = 2; V = 969.67 Den(Calc)= 1.42
Help on Crystal System: 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/Io): 3.02(1), 5.91(0.9), 2.87(0.8),

Physical Properties of Umbite

Help on Cleavage: Cleavage: {010} Perfect, {100} Good
Help on Color: Color: Colorless, Yellowish white.
Help on Density: Density: 2.79
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Umbite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Umbite =2.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEUmbite = 31.74 barns/electron
U=PEUmbite x relectron= 86.06 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (59)Cyclosilicate Three-Membered Rings
  (59.02.01)Umbite and related species Umbite K2ZrSi3O9•(H2O) P 212121 2 2 2 Paraumbite K3Zr2HSi6O18•n(H2O)n=3to7 Unk Ortho Kostylevite K2ZrSi3O9•(H2O) P 21/a 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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

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Dana No: Strunz No: 09.DG.25





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