Paraumbite Mineral Data

Paraumbite Mineral Data +

[Express Minerals] [Minerals for Sale] [About Us] [En EspaÃƒï¿½Ã‚Â±ol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

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.

Search for Paraumbite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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

Diaphaniety:

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

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:

r_electron=2.63 gm/cc
note: r_Paraumbite=2.69 gm/cc.

Fermion Index

Fermion Index = 0.03514
Boson Index = 0.96486

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)

Estimated Radioactivity from Paraumbite - barely detectable

Paraumbite Classification

Dana Class:

59.2.1.2 (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.20-20 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 Paraumbite Information

References:

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

Search for Paraumbite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Paraumbite :

AA Mineral Specimens

B & L Fine Minerals

Crystal Vaults

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

MineralsWeb Fine Minerals

Rockshop.cz

T G Fine Minerals

Wrights Rock Shop

Translate Paraumbite Mineral Data :

Ask about Paraumbite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Paraumbite

K3Zr2HSi6O18·n(H2O) n=3 to 7
Dana No: 59.2.1.2 Strunz No: VIII/F.20-20
Locality:

Notes: