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Chladniite Mineral Data

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General Chladniite Information

Help on Chemical  Formula: Chemical Formula: Na2Ca(Mg,Fe++)7(PO4)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na1.8CaMg7Fe2+0.3(PO4)6(SiO4)0.1
Help on Environment: Environment: In iron and achrondite meteorites.
Help on IMA Status: IMA Status: Approved IMA 1994
Help on Locality: Locality: Carleton type IIICD iron and GRA 95209 primitive achrondite meteorites. Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Synonym: Synonym: IMA1993-010

Chladniite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:2.84592
Help on Cell Dimensions: Cell Dimensions: a = 14.967, c = 42.595, Z = 40; V = 8,263.40 Den(Calc)= 6.81
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.753(1), 2.96(1), 3.694(1),

Physical Properties of Chladniite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Colorless.
Help on Density: Density: 3.01
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Selvage - As a reaction rim, surrounding the host mineral.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Chladniite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.6, w=1.62, bire=0.0200.

Calculated Properties of Chladniite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Chladniite =3.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEChladniite = 2.75 barns/electron
U=PEChladniite x rElectron Density= 8.17 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chladniite is Not Radioactive

Chladniite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.02)(A+ B++)5 (XO4)3
  (38.02.05)Fillowite Group Fillowite Na2Ca(Mn,Fe)7(PO4)6 R 3 3 Johnsomervilleite Na2Ca(Mg,Fe,Mn)7(PO4)6 R 3 3 Chladniite Na2Ca(Mg,Fe)7(PO4)6 R 3 3 Galileiite! NaFe4(PO4)3 R 3 3 Xenophyllite! Na4Fe7(PO4)6 P1 or P1 Tri Stornesite-(Y)! (Y,Ca)[]2Na6(Ca,Na)8(Mg,Fe)43(PO4)36 R 3 3
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.79,p375-380,1994) OPTIC PROP.(Am.Min.,Vol.79,p375-380,1994)
Help on See Also: 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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Dana No: Strunz No: 08.AC.50





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