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 % Na2 O
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 % P2 O5
Oxygen 46.07 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na1.8 CaMg7 Fe2+ 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEChladniite = 2.75 barns/electronU=PEChladniite x r Electron 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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Chladniite
Na2Ca(Mg,Fe++)7(PO4)6
Dana No: 38.02.05.03 Strunz No: 08.AC.50
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