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Nanpingite

Collectors Summary

Color weiß, silberweiß
Streak color weiß
Hardness (Mohs) 2.5
Crystal System monoklin, C2/c

Chemism

Chemical formula

CsAl2(Si,Al)4O10(OH,F)2

Chemical composition

Aluminium, Cäsium, Silicium, Fluor, Sauerstoff, Wasserstoff

Unit weight: 493.111223725 u; Number of atoms in the formula: 20.5

Info

Empirical formula:

CsAl2(Si0.75Al0.25)4O10((OH)0.75F0.25)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.31

1.5

7.32

1.0079470

1.5119205
Oxygen

O

37.31

11.5

56.10

15.9994300

183.9934450
Fluorine

F

1.93

0.5

2.44

18.9984033

9.4992016
Aluminium

Al

16.42

3

14.63

26.9815382

80.9446146
Silicon

Si

17.09

3

14.63

28.0855300

84.2565900
Caesium

Cs

26.95

1

4.88

132.9054520

132.9054520

Analysis wt%

SiO2 : 38.54, Al2O3 : 25.61, FeO : 2.44, MgO : 1.78, K2O : 0.54, Li2O : 0.44, Cs2O : 25.29, F : 1.00, H2O : 3.27 (Ref: Yanshi KuangwuxueZashi,88)

Strunz 9th edition incl. updates

9.EC.15

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
15:Muskovit-Gruppe

Lapis Classification

VIII/H.10-110

VIII: SILIKATE
H: Schichtsilikate
10: Glimmerartige Schicht-silikate mit Baugruppen [Si4O10] 4- und verwandte Strukturen; Glimmer-Gruppe; Seladonit/Muskovit-Reihe (Phengite)

Classification by Hölzel

9.EC.250

9: SILICATES
E: Phyllosilicates
C: Micas-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Mica group  ⇒ True micas

Optical Properties

Color

weiß, silberweiß

Streak color

weiß

Diaphaneity (Transparency)

transparent bis durchscheinend

max. Birefringence

0.037
Birefringence chart\! Nanpingite title=Birefringence chart Nanpingite

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

1.551

RI value β

1.584

RI value γ / ε

1.588

Ri mean

1.574

2V angle

Biaxial (-) 46°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

5.362

Cell parameters b (Å)

8.86

Cell parameters c (Å)

21.42

Cell parameters a/b or c/a

0.605

Cell parameters c/b

2.418

Cell parameters α

90°

Cell parameters β

95.77

Cell parameters γ

90°

Z

4

Volumne (ų)

1012.451

X-Ray Powder Diffraction

3.329(10),
2.664(100),
2.654(10),
2.129(80),
2.122(20),
1.562(10),
1.328(10)
XRD chart Nanpingite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.5

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.11

3.235 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

China/Fujian, Provinz/Nanping, Präfektur/Yanping, Kreis/Nanping Pegmatitfeld/Pegmatit No. 31

Preface

Author (Name, Year)

Yang Yueqing & Ni Yunxiang & Wang Liben & Wang Wenying & Zhang Yaping

References

Acta Petrologica et Mineralogica (in Chinese); = Yanshi Kuangwuxue Zashi 7 (1988), 49

IMA group assignments

Other languages

German

Nanpingit

Spanish

Nanpingita

English

Nanpingite

French

Nanpingite

Russian

Нанпингит

Russian

Наньпингит

Simplified Chinese

南平石

CNMNC symbol

Symbol

Npg

Locations with GPS information