Montebrasite Mineral Data (original) (raw)

General Montebrasite Information

Help on Chemical Formula: Chemical Formula:

LiAl(PO4)(OH,F)

Help on Composition: Composition:

Molecular Weight = 146.40 gm

Lithium 4.74 % Li 10.21 % Li2O

Aluminum 18.43 % Al 34.82 % Al2O3

Phosphorus 21.16 % P 48.48 % P2O5

Hydrogen 0.52 % H 4.61 % H2O

Oxygen 51.91 % O

Fluorine 3.24 % F 3.24 % F

- % F -1.37 % -O=F2

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

LiAl(PO4)(OH)0.75F0.25

Help on Environment: Environment:

Forms large-sized crystals in lithium-bearing pegmatites. Species and name natromontebrasite are discredited because natromontebrasite is a mixture of OH-rich amblygonite with lacro ixite and subordinate wardite

Help on IMA Status: IMA Status:

Discredited IMA 2005 No. 05-E

Help on Locality: Locality:

Montebras, Creuse, France. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named for the locality in 1872.

Help on Name Pronunciation: Name Pronunciation:

Montebrasite + Pronunciation Say MONTEBRASITE

Montebrasite Image

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Montebrasite Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =0.7269:1:0.7093

Help on Cell Dimensions: Cell Dimensions:

a = 5.178, b = 7.123, c = 5.053, Z = 2; alpha = 112.03°, beta = 97.9°, gamma = 67.81° V = 158.45 Den(Calc)= 3.07

Help on Crystal System: Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.968(1), 3.164(0.9), 4.672(0.7),

Help on Forms: Forms:

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| | Forms:( 0 2 1) ( 0 1 0) ( 0 2 1) ( 1 1 0) ( 1 0 0) ( 0 0 1) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Click Here for Large Montebrasite Structure Window Crystal Structure:

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| | Groat L A , Chakoumakos B C , Brouwer D H , Hoffman C M , Fyfe C A , Morell H , Schultz A J , American Mineralogist , 88 (2003) p.195-210, The amblygonite (LiAlPO4F) - montebrasite (LiAlPO4OH) solid solution:, A combined powder and single-crystal neutron diffraction and solid-state Li MAS, CP MAS,, and REDOR NMR study, Sample: from Tanco Pegmatite, Bernic Lake, Manitoba at T = 295 K, Note: O3-x coordinate modified View Additional jPOWD Structure files for Montebrasite [10] [11] [12] [13] [14] [15] [3] [4] [5] [6] [7] [8] [9] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Montebrasite

Help on Cleavage: Cleavage:

{100} Perfect, {110} Good, {011} Distinct

Help on Color: Color:

Bluish, Colorless, Greenish, Greenish gray, Gray white.

Help on Density: Density:

3.027

Help on Diaphaneity: Diaphaneity:

Transparent to Translucent

Help on Fracture: Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Help on Habit: Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Help on Habit: Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Help on Hardness: Hardness:

5.5-6 - Knife Blade-Orthoclase

Help on Luster: Luster:

Vitreous - Greasy

Help on Streak: Streak:

white

Optical Properties of Montebrasite

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.199,KPDmeas= 0.1999,KC= 0.2093
Ncalc = 1.63 - 1.64

Help on Optical Data: Optical Data:

Biaxial (-), a=1.57-1.6, b=1.61, g=1.62, bire=0.0200-0.0500, 2V(Calc)=52-88, 2V(Meas)=81.5.

Calculated Properties of Montebrasite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Montebrasite =3.03 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0038058115
Boson Index = 0.9961941885

Help on Photoelectric: Photoelectric:

PEMontebrasite = 1.61 barns/electron
U=PEMontebrasite x rElectron Density= 4.80 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montebrasite is Not Radioactive

Montebrasite Classification

Help on Dana Class: Dana Class:

41.05.08.02 (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 Montebrasite 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 Montebrasite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST

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Ask about Montebrasite here :
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Print or Cut-and-Paste your Montebrasite Specimen Label here :

Montebrasite

LiAl(PO4)(OH,F)
Dana No: 41.05.08.02 Strunz No: 08.BB.05
Locality:

Notes: