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Chladniite

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Ernst Florens Friedrich Chladni
Formula:
{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36
Colour:
Colorless
Lustre:
Sub-Vitreous, Resinous
Hardness:
4½ - 5
Specific Gravity:
3.017 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named in honour of Ernst Florens Friedrich Chladni (1756-1827), University of Riga, Latvia, "father" of meteoritics.
Chemically close minerals (also anhydrous) include czochralskiite, brianite, and merrillite - all known from meteorites. Johnsomervilleite of the same group is also somewhat chemically similar.

Originally found as a single grain (975 x 175 micrometers) with chlorapatite, olivine, pyroxene, plagioclase, schreibersite, and troilite.

Just recently a terrestrial occurrence evidence was reported by Rius (2016). It is of pegmatitic origin and was determined using the relatively new technique: through-the-substrate microdiffraction (tts-μXRD). This terrestrial chladniite is different from the meteoritic one in cation(Mg, Fe+Mn & Ca) ordering, and is said to have the M(1) site dominated by Mn (the question thus arises if this is still chladniite).


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Classification of ChladniiteHide

Approved
Approval Year:
1993
8.AC.50

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Dana 7th ed.:
38.2.9.3
38.2.5.3

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
2 : (AB)5(XO4)3

Physical Properties of ChladniiteHide

Sub-Vitreous, Resinous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Rhombohedral
Fracture:
Irregular/Uneven
Density:
3.017(2) g/cm3 (Calculated)

Optical Data of ChladniiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.600 nε = 1.620
Birefringence:
0.02
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Type:
Anisotropic
Anisotropism:
weak
Colour in reflected light:
Gray
Internal Reflections:
orange-brown
Pleochroism:
Non-pleochroic
Comments:
Weakly anisotropic

Chemical Properties of ChladniiteHide

Formula:
{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36
IMA Formula:
Na2CaMg7(PO4)6
Idealised Formula:
Na2CaMg7(PO4)6
Common Impurities:
Fe,Mn,Si

Crystallography of ChladniiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Setting:
R3
Cell Parameters:
a = 14.967(2) Å, c = 42.595(4) Å
Ratio:
a:c = 1 : 2.846
Unit Cell V:
8,263.40 ų (Calculated from Unit Cell)
Z:
18
Morphology:
Rims around other phosphates and silicates

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.69 (strong)
3.56 (medium)
3.08 (weak)
2.96 (strong)
2.50 (medium)
2.75 (strong)
2.13 (medium)
1.851 (medium)
Comments:
American Mineralogist 79:375 (1994)

Type Occurrence of ChladniiteHide

Place of Conservation of Type Material:
Smithsonian Institute
Geological Setting of Type Material:
In type IIICD iron meteorite and primitive achondrite meteorite.

Synonyms of ChladniiteHide

Other Language Names for ChladniiteHide

German:Chladniit
Spanish:Chladniita

Relationship of Chladniite to other SpeciesHide

Member of:
Other Members of this group:
Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
Galileiite{Fe2+}{Na8}{Fe2+4Na4}{Fe2+43}(PO4)36Trig. 3 : R3
JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.
Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
XenophylliteNa4Fe2+7(PO4)6Tric. 1 : P1

Common AssociatesHide

Related Minerals - Nickel-Strunz GroupingHide

8.AC.WopmayiteCa6Na3□Mn(PO4)3(PO3OH)4 Trig. 3m : R3c
8.AC.05HowardevansiteNaCuFe2(VO4)3Tric. 1 : P1
8.AC.10Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3Mon.
8.AC.10Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3Mon. 2/m : P2/b
8.AC.10Caryinite(Na,Pb)(Ca,Na)CaMn2+2(AsO4)3Mon. 2/m
8.AC.10Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
8.AC.10HagendorfiteNaCaMn2+Fe2+2(PO4)3Mon. 2/m : B2/b
8.AC.10JohilleriteNa(Mg,Zn)3Cu(AsO4)3Mon. 2/m : B2/b
8.AC.10Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3Mon.
8.AC.10NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3Mon. 2/m : B2/b
8.AC.10VaruliteNaCaMn2+Mn2+2(PO4)3Mon. 2/m : B2/b
8.AC.10FerrohagendorfiteNaCaFe2+Fe2+2(PO4)3Mon.
8.AC.10BradaczekiteNaCu4(AsO4)3Mon. 2/m : B2/b
8.AC.10YazganiteNaFe3+2(Mg,Mn2+)(AsO4)3 · H2OMon. 2/m : B2/b
8.AC.10GroatiteNaCaMn2(PO4)(HPO4)2Mon. 2/m : B2/b
8.AC.15BobfergusoniteNa2Mn5FeAl(PO4)6Mon. 2/m : P2/b
8.AC.15Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3Mon. 2/m : P21/b
8.AC.15Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3Mon. 2/m : P21/b
8.AC.15Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3Mon. 2/m
8.AC.15Ferrorosemaryite◻NaFe2+Fe3+Al(PO4)3Mon.
8.AC.15Qingheiite-(Fe2+)Na2Fe2+MgAl(PO4)3Mon. 2/m : P21/m
8.AC.18ManitobaiteNa16Mn2+ 25Al8(PO4)30Mon. m : Pb
8.AC.20MarićiteNaFe2+(PO4)Orth. mmm (2/m 2/m 2/m) : Pmna
8.AC.25Berzeliite(NaCa2)Mg2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25ManganberzeliiteNaCa2Mn2+2(AsO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25Palenzonaite(Ca,Na)3CaMn2+2(VO4)3Iso. m3m (4/m 3 2/m) : Ia3d
8.AC.25SchäferiteCa2NaMg2(VO4)3Iso.
8.AC.30BrianiteNa2CaMg(PO4)2Mon. 2/m : P21/b
8.AC.35Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2Orth. mm2 : Pca21
8.AC.40Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2Trig. 3m (3 2/m) : P3m1
8.AC.40Bario-olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2 · Trig. 3 : P3
8.AC.45StrontiowhitlockiteSr9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45WhitlockiteCa9Mg(PO4)6(HPO4)Trig. 3m : R3c
8.AC.45MerrilliteCa9NaMg(PO4)7Trig. 3m : R3m
8.AC.45TuiteCa3(PO4)2Trig. 3m (3 2/m) : R3m
8.AC.45FerromerrilliteCa9NaFe2+(PO4)7Trig. 3m : R3c
8.AC.45BobdownsiteCa9Mg(PO4)6(PO3F)Trig. 3m : R3c
8.AC.50Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.
8.AC.50Galileiite{Fe2+}{Na8}{Fe2+4Na4}{Fe2+43}(PO4)36Trig. 3 : R3
8.AC.50Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36Trig. 3 : R3
8.AC.50XenophylliteNa4Fe2+7(PO4)6Tric. 1 : P1
8.AC.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2Trig.
8.AC.60KosnariteKZr2(PO4)3Trig. 3m (3 2/m) : R3c
8.AC.65Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2Mon. 2/m : P21/b
8.AC.70StanfielditeCa4Mg5(PO4)6Mon.
8.AC.75RonneburgiteK2MnV4O12Mon. 2/m
8.AC.80Tillmannsite(Ag3Hg)(VO4,AsO4)Tet. 4 : I4
8.AC.85FilatoviteK(Al,Zn)2(As,Si)2O8Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

38.2.5.1Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36Trig. 3 : R3
38.2.5.2JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36Trig.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ChladniiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1994): 79: 375-380.
Floss, C., 1999, Fe, Mg, Mn-bearing phosphates in the GRA 95209 meteorite: occurrences and mineral chemistry, American Mineralogist, v. 84, p. 1354-1359.
Rius, J. (2016): Terrestrial Chladniite Embedded In Polished Thin Sections Refined From Tts Microdiffraction Data. MISCA2016, MS6-OP2; http://forum.amiminerals.it/viewtopic.php?f=5&t=12854 (2016)

Internet Links for ChladniiteHide

Localities for ChladniiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Antarctica
 
  • Eastern Antarctica
    • Transantarctic Mts
      • Wisconsin Range
AmMin 84:1354-1359
American Mineralogist, Volume 84, pages 1354–1359, 1999
Argentina
 
Vallcorba, O., Casas, L., Colombo, F., Frontera, C., & Rius, J. (2017). First terrestrial occurrence of the complex phosphate chladniite: crystal-structure refinement by synchrotron through-the-substrate microdiffraction. European Journal of Mineralogy, 29(2), 287-293.
USA (TL)
 
  • Texas
    • Hamilton Co.
      • Carlton
American Mineralogist, Volume 79, pages 375-380, 1994
Mineral and/or Locality  
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