Natromontebrasite Mineral Data

Natromontebrasite Mineral Data +

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General Natromontebrasite Information

Chemical Formula:

(Na,Li)Al(PO4)(OH,F)

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

Empirical Formula:

Na_0.75Li_0.25Al(PO₄)(OH)_0.75F_0.25

IMA Status:

Valid Species (Pre-IMA) 1913

Locality:

Link to MinDat.org Location Data.

Synonym:

Fremontite

Natromontebrasite Image

Images:

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

Axial Ratios:

a:b:c =0.7285:1:0.7074

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

Crystal System:

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

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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

Cleavage:

[???] Distinct, [???] Distinct, [???] Distinct

Color:

White, Grayish white.

Density:

3.04

Diaphaniety:

Translucent to opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Natromontebrasite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.086 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1825,KPDmeas= 0.1987,KC= 0.1996

Optical Data:

Biaxial (+), a=1.594, b=1.603, g=1.615, bire=0.0210

Calculated Properties of Natromontebrasite

Electron Density:

r_electron=2.99 gm/cc
note: r_{Natromontebrasite}=3.04 gm/cc.

Fermion Index

Fermion Index = 0.00105
Boson Index = 0.99895

Photoelectric:

PE_{Natromontebrasite}= 1.64 barns/electron
U=PE_{Natromontebrasite} x r_electron= 4.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natromontebrasite is Not Radioactive

Natromontebrasite Classification

Dana Class:

41.5.8.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.5)where (A B)2 (XO4) Zq

(41.5.8)Dana Group

41.5.8.1 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

41.5.8.2 Montebrasite LiAl(PO4)(OH,F) P1 1

41.5.8.3 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1

Strunz Class:

VII/B.02-50 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.02 - Amblygonite group, Griphite - Tavorite

VII/B.02-10 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3

VII/B.02-20 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m

VII/B.02-30 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

VII/B.02-40 Montebrasite LiAl(PO4)(OH,F) P1 1

VII/B.02-50 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1

VII/B.02-60 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Other Natromontebrasite Information

References:

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

See Also:

Links to other databases for Natromontebrasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Natromontebrasite

(Na,Li)Al(PO4)(OH,F)
Dana No: 41.5.8.3 Strunz No: VII/B.02-50
Locality:

Notes: