Umbite Mineral Data

Umbite Mineral Data +

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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)

IMA Status:

Approved IMA 1983

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 39697

PDF 35-709

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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 - DisphenoidalH-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),

Crystal Structure:

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Ilyushin G D , Izvestiya Akademii Nauk SSSR Neorganicheskie Materialy , 29 (1993) p.971-975, New data on the crystal structure of umbite K2ZrSi3O9*H2O

Physical Properties of Umbite

Cleavage:

[010] Perfect, [100] Good

Color:

Colorless, Yellowish white.

Density:

2.79

Diaphaniety:

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

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:

r_electron=2.71 gm/cc
note: r_Umbite=2.79 gm/cc.

Fermion Index

Fermion Index = 0.03429
Boson Index = 0.96571

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)

Estimated Radioactivity from Umbite - barely detectable

Umbite Classification

Dana Class:

59.2.1.1 (59)Cyclosilicate Three-Membered Rings

(59.2)hydrated

(59.2.1)Umbite and related species

59.2.1.1 Umbite K2ZrSi3O9·(H2O) P 2₁2₁2₁ 2 2 2

59.2.1.2 Paraumbite K3Zr2HSi6O18·n(H2O)n=3to7 Unk Ortho

59.2.1.3 Kostylevite K2ZrSi3O9·(H2O) P 2₁/a 2/m

Strunz Class:

VIII/F.20-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) Triplet chains [Si3O9]6-

VIII/F.20 - Sorensenite - Para-umbite series

VIII/F.20-05 Sorensenite Na4SnBe2Si6O18·2(H2O) C 2/c 2/m

VIII/F.20-10 Umbite K2ZrSi3O9·(H2O) P 2₁2₁2₁ 2 2 2

VIII/F.20-20 Paraumbite K3Zr2HSi6O18·n(H2O)n=3to7 Unk Ortho

Other Umbite Information

References:

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

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Umbite

K2ZrSi3O9·(H2O)
Dana No: 59.2.1.1 Strunz No: VIII/F.20-10
Locality:

Notes: