Chladniite Mineral Data

Chladniite Mineral Data

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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

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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 - RhombohedralH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Chladniite

Electron Density:

r_electron=2.97 gm/cc
note: r_Chladniite=3.01 gm/cc.

Fermion Index

Fermion Index = 0.02093
Boson Index = 0.97907

Photoelectric:

PE_Chladniite= 2.75 barns/electron
U=PE_Chladniite x r_electron= 8.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chladniite is Not Radioactive

Chladniite Classification

Dana Class:

38.2.5.3 (38)Anhydrous Phosphates, etc

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

(38.2.5)Dana Group

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

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

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

38.2.5.4 Galileiite! NaFe4(PO4)3 R 3 3

Strunz Class:

VII/A.08-05 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of medium and big size: Mg, Mn,Fe, Cu, Zn, and Ca, Na

VII/A.08 - Chladniite - Berzeliite - Palenzonaite series

VII/A.08-03 Galileiite! NaFe4(PO4)3 R 3 3

VII/A.08-05 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3

VII/A.08-10 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3

VII/A.08-20 Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3

VII/A.08-30 Berzeliite (Ca,Na)3(Mg,Mn)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-40 Manganberzeliite (Ca,Na)3(Mn,Mg)2(AsO4)3 I a3d 4/m 3 2/m

VII/A.08-45 Schaferite! NaCa2Mg2(VO4)3 I a3d 4/m 3 2/m

VII/A.08-50 Palenzonaite (Ca,Na)3Mn(V,As,Si)3O12 I a3d 4/m 3 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Chladniite

Na2Ca(Mg,Fe++)7(PO4)6
Dana No: 38.2.5.3 Strunz No: VII/A.08-05
Locality:

Notes: