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Natromontebrasite Mineral Data

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General Natromontebrasite Information

Help on Chemical  Formula: Chemical Formula: (Na,Li)Al(PO4)(OH,F)
Help on Composition: Composition: Molecular Weight = 158.44 gm
   Sodium      10.88 %  Na   14.67 % Na2O
   Lithium      1.10 %  Li    2.36 % Li2O
   Aluminum    17.03 %  Al   32.18 % Al2O3
   Phosphorus  19.55 %  P    44.80 % P2O5
   Hydrogen     0.48 %  H     4.26 % H2O
   Oxygen      47.97 %  O
   Fluorine     3.00 %  F     3.00 % F
                 -   %   F    -1.26 % -O=F2    
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.75Li0.25Al(PO4)(OH)0.75F0.25
Help on Environment: Environment: Natromontebrasite (1913) has been shown to be a mixture of an OH-rich amblygonite and lacroixite, with subordinate quantities of wardite.
Help on IMA Status: IMA Status: Discredited IMA 2006
Help on Locality: Locality: Canyon City and Eight Mile Park, Fremont County, Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition and resemblance to montebrasite.
Help on Name Pronunciation: Name Pronunciation: Natromontebrasite + Pronunciation Say NATROMONTEBRASITE
Help on Synonym: Synonym: Fremontite
 

Natromontebrasite Image

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  Natromontebrasite

Comments: Pale tan to orange natromontebrasite cleavages in quartz.
Location: Mica Load, Canon City, Fremont County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natromontebrasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7285:1:0.7074
Help on Cell Dimensions: Cell Dimensions: a = 5.18, b = 7.11, c = 5.03, Z = 2; alpha = 111.035°, beta = 97.818°, gamma = 68.118° V = 158.96 Den(Calc)= 3.31
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on Forms: Forms:

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Help on Above

Forms: ( 3 3 2) ( 0 1 1) ( 1 2 0) ( 0 1 0) ( 0 2 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Physical Properties of Natromontebrasite

Help on Cleavage: Cleavage: {???} Distinct, {???} Distinct, {???} Distinct
Help on Color: Color: White, Grayish white.
Help on Density: Density: 3.04
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white
 

Optical Properties of Natromontebrasite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.077 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1841,KPDmeas= 0.1987,KC= 0.1996
Ncalc = 1.61 - 1.65
Help on Optical Data: Optical Data: Biaxial (+), a=1.594, b=1.603, g=1.615, bire=0.0210
 

Calculated Properties of Natromontebrasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Natromontebrasite =3.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010523884
Boson Index = 0.9989476116
Help on Photoelectric: Photoelectric: PENatromontebrasite = 1.64 barns/electron
U=PENatromontebrasite x rElectron Density= 4.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natromontebrasite is Not Radioactive
 

Natromontebrasite Classification

Help on  Dana Class: Dana Class: 41.05.08.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.08)Amblygonite Group
 
41.05.08.01 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1
 
41.05.08.02 Montebrasite? LiAl(PO4)(OH,F) P1 1
 
41.05.08.03 Natromontebrasite? (Na,Li)Al(PO4)(OH,F) P1 1
Help on  Strunz Class: Strunz Class: 08.BB.05 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BB -With only medium-sized cations, (OH, etc.):RO4 � 1:1
 
08.BB.05 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1
 
08.BB.05 Natromontebrasite? (Na,Li)Al(PO4)(OH,F) P1 1
 
08.BB.05 Montebrasite? LiAl(PO4)(OH,F) P1 1
 
08.BB.05 Tavorite LiFe(PO4)(OH) P1 or P1 Tri
 

Other Natromontebrasite Information

Help on References: References: NAME( Dana8) 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 Natromontebrasite :
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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Natromontebrasite

(Na,Li)Al(PO4)(OH,F)
Dana No: 41.05.08.03 Strunz No: 08.BB.05
Locality:

 

Notes:

 

 
   
 


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