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Natromontebrasite (Natromontebrasit)

Collectors Summary

Color weiß, grauweiß
Streak color weiß
Hardness (Mohs) 5.5
Cleavages {???} deutlich, {???} deutlich, {???} deutlich
Solubility +++ Säuren
Crystal System triklin, P1

Chemism

Chemical formula

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

Chemical composition

Aluminium, Lithium, Natrium, Fluor, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 158.4357806125 u; Number of atoms in the formula: 8.75

Info

Empirical formula:

(Na0.75Li0.25)Al(PO4)((OH)0.75F0.25)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.48

0.75

8.57

1.0079470

0.7559603
Lithium

Li

1.10

0.25

2.86

6.9412000

1.7353000
Oxygen

O

47.97

4.75

54.29

15.9994300

75.9972925
Fluorine

F

3.00

0.25

2.86

18.9984033

4.7496008
Sodium

Na

10.88

0.75

8.57

22.9897702

17.2423277
Aluminium

Al

17.03

1

11.43

26.9815382

26.9815382
Phosphorus

P

19.55

1

11.43

30.9737612

30.9737612

Analysis wt%

Li2O : 3.21, Na2O : 11.23, Al2O3 : 33.59, P2O5 : 44.35, F : 5.63, H2O : 4.78 (Ref: Dana, 7th ed. 2)

Strunz 9th edition incl. updates

8.BB.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
B: Mit ausschließlich mittelgroßen [Kationen], (OH, etc.): RO4 ≤ 1:1
05:Amblygonit-Gruppe

Classification by Hölzel

8.BA.520

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
A: Phosphates, C Be,Li
5: Li-Phosphates, C medium Amblygonite-Group

IMA status

diskreditiert, Natromontebrasit ist eine Mischung aus OH-reichem Amblygonit mit Lacroixit und nachrangigem Wardit (IMA No. 05-E 2005).
Lit.: Fransolet, A-M, et al., Can.Mineral. 45 (2007) S.391-396.

Optical Properties

Color

weiß, grauweiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend bis opak

max. Birefringence

0.021
Birefringence chart\! Natromontebrasite title=Birefringence chart Natromontebrasite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.594

RI value β

1.603

RI value γ / ε

1.615

Ri mean

1.604

2V angle

Biaxial (+) 80°

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

triklin

Class (H-M)

1

Space Group number

2

Space Group

P1

Cell parameters a (Å)

5.18

Cell parameters b (Å)

7.11

Cell parameters c (Å)

5.03

Cell parameters a/b or c/a

0.729

Cell parameters c/b

0.707

Cell parameters α

112.5

Cell parameters β

97.83

Cell parameters γ

68.13

Z

2

Volume (ų)

158.83

X-Ray Powder Diffraction

4.660(50),
3.338(20),
3.271(20),
3.230(30),
3.148(90),
2.962(100),
2.496(30),
2.390(20)
XRD chart Natromontebrasite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Hardness (Mohs)

5.5

Density (g/cm³)

3.04

3.313 ( ρ calc. Mineralienatlas )

Cleavages

{???} deutlich, {???} deutlich, {???} deutlich

Instability

+++ Säuren

Preface

Author (Name, Year)

Gonnard, 1913

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 404

Other languages

German

Natromontebrasit

Spanish

Natromontebrasita

English

Natromontebrasite

French

Natromontebrasite

Alternative Name

Fremontite

English

Natramblygonite

German

Natronamblygonit

Simplified Chinese

叶双晶石

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 2wR-fuEro0O0LQKdXKoAWA
GUID (Global unique identifier) 7E7E04DB-2BE1-43A3-B42D-029D5CAA0058
Database ID 2700