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Chladniite (Chladniit)

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz, Harzglanz
Crystal System trigonal, R3

Chemism

Chemical formula

Na2CaMg7(PO4)6

Chemical composition

Calcium, Magnesium, Natrium, Phosphor, Sauerstoff

Unit weight: 826.0222476 u; Number of atoms in the formula: 40

Info

Empirical formula:

Na2CaMg7(PO4)6

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

46.49

24

60.00

15.9994300

383.9863200
Sodium

Na

5.57

2

5.00

22.9897702

45.9795404
Magnesium

Mg

20.60

7

17.50

24.3050600

170.1354200
Phosphorus

P

22.50

6

15.00

30.9737612

185.8425672
Calcium

Ca

4.85

1

2.50

40.0784000

40.0784000

Analysis wt%

Na2O : 6.60, MgO : 33.50, P2O5 : 49.90, CaO : 6.59, FeO : 2.20, SiO2 : 0.59 (Ref: American Mineralogist 94)

Strunz 9th edition incl. updates

8.AC.50

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
C: Mit mittelgroßen und großen [Kationen]
50:Fillowit-Gruppe

Lapis Classification

VII/A.08-005

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
8: Mittelgroße und große Kationen: Mg-Mn-Fe-Cu-Zn und Ca-Na

Classification by Hölzel

8.AC.320

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
C: Phosphates, C medium + large
3: Whitlockite-Group

Dana 8th edition

38.02.05.03

38: Anhydrous Phosphates, etc
02: Anhydrous Phosphates, etc (A+ B++)5 (XO4)3
05: Fillowite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Fillowite group

Optical Properties

Color

farblos

Streak color

weiß

Change in color

grau in reflektiertem Licht

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz, Harzglanz

max. Birefringence

0.01~
Birefringence chart\! Chladniite title=Birefringence chart Chladniite

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

1.60

RI value γ / ε

1.62

Ri mean

1.61

2V angle

Uniaxial

Reflectivity: (Lambda nm) ↓, ↑, Ø

(470) 5.3, 5.6, 5.5
Reflection chart Chladniite

Reflectivity Ø

5.45

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell parameters a (Å)

14.967

Cell parameters b (Å)

-

Cell parameters c (Å)

42.595

Cell parameters a/b or c/a

2.846

Cell parameters c/b

-

Z

18

Volumne (ų)

8263.4

X-Ray Powder Diffraction

3.694(100),
3.558(50),
3.085(30),
2.960(100),
2.753(100),
2.500(50),
2.126(50),
1.851(50)
XRD chart Chladniite

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

Physical Properties

Density (g/cm³)

3.01

2.988 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Texas/Hamilton Co./Carlton/Carlton-Meteorit

Preface

Author (Name, Year)

McCoy & Steele & Keil & Leonard & Endress, 1994

References

American Mineralogist 79 (1994), 375

IMA group assignments

 
Fillowite group
 
 
 

 
 
Chladniite
Na2CaMg7(PO4)6
trigonal
R3

 
 
Fillowite
Na2Ca(Mn,Fe2+)7(PO4)6
trigonal
R3

 
 
Galileiite
NaFe2+4(PO4)3
trigonal
R3

 
 
Johnsomervilleite
Na2Ca(Mg,Fe2+,Mn)7(PO4)6
trigonal
 

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Actuality: 20. Mar 2023 - 14:35:50

Other languages

German

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French

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English

Chladniite

Spanish

Chladniíta

Russian

Хладниит

CNMNC (IMA)-Number

IMA 1993-010

CNMNC symbol

Symbol

Clad

Locations with GPS information