Mineralogy Database

Mountainite Mineral Data

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General Mountainite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na2,K2)2Si4O10•3(H2O)
Help on Composition: Composition: Molecular Weight = 409.00 gm
   Potassium   4.78 %  K     5.76 % K2O
   Sodium      5.62 %  Na    7.58 % Na2O
   Calcium     9.80 %  Ca   13.71 % CaO
   Silicon    27.47 %  Si   58.76 % SiO2
   Hydrogen    1.48 %  H    13.21 % H2O
   Oxygen     50.85 %  O
             ______        ______ 
             100.00 %       99.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaCaK0.5Si4O10•3(H2O)
Help on Environment: Environment: Intrusive kimberlite and differentiated alkalic massif (Lovozero, Russia).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: In a kimberlite pipe at Kimberley, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Edgar Donald Mountain, Professor of Geology, Rhodes University, Grahamstown, South Africa.
Help on Name Pronunciation: Name Pronunciation: Mountainite + Pronunciation Say MOUNTAINITE

Mountainite Image

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  Mountainite   Raite

Comments: Bright white fibrous acicular mountainite crystal aggregate with pale golden raite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mountainite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0625:1:2.0625
Help on Cell Dimensions: Cell Dimensions: a = 13.51, b = 6.55, c = 13.51, Z = 4; beta = 104° V = 1,160.00 Den(Calc)= 2.34
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a,P 21/c,P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.94(1), 6.6(0.8), 4.67(0.7),13.1(0.7), 1.967(0.6), 2.8(0.6), 4.18(0.5),

Physical Properties of Mountainite

Help on Cleavage: Cleavage: {001} Distinct
Help on Color: Color: White.
Help on Density: Density: 2.36
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Felted - Occurs as minute crystalling aggregates with the form of felt material.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Luster: Luster: Silky
Help on Streak: Streak: white

Optical Properties of Mountainite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2173,KPDmeas= 0.2155,KC= 0.2216
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (+), a=1.5-1.504, b=1.505-1.51, g=1.513-1.519, bire=0.0130-0.0150, 2V(Calc)=78-80, 2V(Meas)=moderate.

Calculated Properties of Mountainite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.36 gm/cc
note: Specific Gravity of Mountainite =2.34 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMountainite = 2.84 barns/electron
U=PEMountainite x relectron= 6.70 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 69.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Mountainite per GRapi unit = 1.44 (%)

Estimated Radioactivity from Mountainite - barely detectable


Mountainite Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.02)related species
  (77.02.03)Dana Group Mountainite (Ca,Na2,K2)2Si4O10•3(H2O) P 21/a,P 21/c,P 21/n 2/m
Help on  Strunz Class: Strunz Class: 09.GG.10 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GG -Unclassified zeolites
09.GG.10 Mountainite (Ca,Na2,K2)2Si4O10•3(H2O) P 21/a,P 21/c,P 21/n 2/m

Other Mountainite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Mountainite :
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.GG.10





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