Chladniite Mineral Data

General Chladniite Information

Chemical Formula:

Na2Ca(Mg,Fe++)7(PO4)6

Composition:

Molecular Weight = 847.39 gm

Sodium 4.88 % Na 6.58 % Na₂O

Calcium 4.73 % Ca 6.62 % CaO

Magnesium 20.08 % Mg 33.29 % MgO

Iron 1.98 % Fe 2.54 % FeO

Silicon 0.33 % Si 0.71 % SiO₂

Phosphorus 21.93 % P 50.25 % P₂O₅

Oxygen 46.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_1.8CaMg₇Fe²⁺_0.3(PO₄)₆(SiO₄)_0.1

Environment:

In iron and achrondite meteorites.

IMA Status:

Approved IMA 1994

Locality:

Carleton type IIICD iron and GRA 95209 primitive achrondite meteorites. Link to MinDat.org Location Data.

Name Origin:

Named for Ernst Florens Friedrich Chladni (1756-1827), German physicist, University of Riga, Riga, Latvia who first espoused the extraterrestrial origin of meteorites.

Synonym:

IMA1993-010

Chladniite Image

Images:

Chladniite

Comments: B&W reflected light image of chladniite (Ch). Silicates are olivine (Ol), pyroxene (Px), and plagioclase (Pl). Chlorapatite (Ca). Schreibersite (Sc) and Fe,Ni metal (M) encloses the entire assemblage.
Location: Carlton (IIICD) iron meteorite. (AmMin, v79:375). Scale: Scale Bar 200 µm.
© American Mineralogist

Chladniite Crystallography

Axial Ratios:

a:c = 1:2.84592

Cell Dimensions:

a = 14.967, c = 42.595, Z = 40; V = 8,263.40 Den(Calc)= 6.81

Crystal System:

Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.753(1), 2.96(1), 3.694(1),

Physical Properties of Chladniite

Cleavage:

{???} Good

Color:

Colorless.

Density:

3.01

Diaphaneity:

Transparent

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Hardness:

4 - Fluorite

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Chladniite

Gladstone-Dale:

CI meas= -0.06 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.532 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.0896,KPDmeas= 0.2027,KC= 0.1912
Ncalc = 1.58 - 2.3

Optical Data:

Uniaxial (-), e=1.6, w=1.62, bire=0.0200.

Calculated Properties of Chladniite

Electron Density:

Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Chladniite =3.01 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Chladniite= 2.75 barns/electron
U=PE_Chladniite x rElectron Density= 8.17 barns/cc.

Radioactivity:

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

Chladniite Classification

Dana Class:

38.02.05.03 (38)Anhydrous Phosphates, etc

(38.02)(A+ B++)5 (XO4)3

(38.02.05)Fillowite Group

38.02.05.01 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

38.02.05.02 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

38.02.05.03 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

38.02.05.04 Galileiite! NaFe4(PO4)3 R 3 3

38.02.05.05 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri

38.02.05.06 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3

Strunz Class:

08.AC.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AC -With medium-sized and large cations

08.AC.50 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

08.AC.50 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

08.AC.50 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

08.AC.50 Galileiite! NaFe4(PO4)3 R 3 3

08.AC.50 Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3

08.AC.50 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri

Other Chladniite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.79,p375-380,1994) OPTIC PROP.(Am.Min.,Vol.79,p375-380,1994)

See Also:

Links to other databases for Chladniite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Chladniite Specimen Label here :

Chladniite

Na2Ca(Mg,Fe++)7(PO4)6
Dana No: 38.02.05.03 Strunz No: 08.AC.50
Locality:

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