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Delhayelite

A valid IMA mineral species
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About DelhayeliteHide

Formula:
(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O
Colour:
Colourless; Silver-grey, Greenish-grey
Specific Gravity:
2.60
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1959 by Th. G. Sahama and K. Hytönen after Fernand Delhaye (Clermont-Ferrand February 4 1880 - Saint-Gillis (Brussels) December 15 1946), of Belgian nationality. He worked in Central Africa.
Easily hydrothermally altered to hydrodelhayelite. Chemically somewhat similar to steudelite and sacrofanite.


Unique IdentifiersHide

Mindat ID:
1251
Long-form identifier:
mindat:1:1:1251:1
GUID
(UUID V4):
e3f09ba8-3a5f-43b7-b239-164a59e0041e

IMA Classification of DelhayeliteHide

Approved
IMA Formula:
K7Na3Ca5Al2Si14O38F4Cl2
First published:
1959

Classification of DelhayeliteHide

9.EB.10

9 : SILICATES (Germanates)
E : Phyllosilicates
B : Double nets with 4- and 6-membered rings
72.5.1.4

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
5 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with corrugated and complex layers
17.10.9

17 : Silicates Containing other Anions
10 : Silicates with sulphate, molybdate or tungstate

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
DhyIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DelhayeliteHide

Transparency:
Translucent
Colour:
Colourless; Silver-grey, Greenish-grey
Cleavage:
Distinct/Good
Parallel to (010)
Density:
2.60(3) g/cm3 (Measured)    2.50 g/cm3 (Calculated)

Optical Data of DelhayeliteHide

Type:
Biaxial (-)
RI values:
nα = 1.530 - 1.532 nβ = 1.532(2) nγ = 1.533 - 1.533
2V:
Measured: 83° (3), Calculated: 83°
Birefringence:
observed birefringence is 0.002-0.003; reported α, β, and γ all given as ≈1.532; the calculated birefringence from having these values all assigned as 1.532 yields δ=0.000, which is not quite correct. Hence, α and γ were slightly adjusted (3rd and 4th decimal place, still within measured errors) to give the correct birefringence and measured 2V°.
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak
Pleochroism:
Non-pleochroic
Comments:
nominally colorless, but sections cut perpendicular to [010] may show an anomalous bluish-gray color.
Comments:
X=a, Y=c, Z=b

Chemistry of DelhayeliteHide

Mindat Formula:
(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 · 18H2O
Common Impurities:
Ti,Fe,Mn,Mg

Crystallography of DelhayeliteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 13.06 Å, b = 24.65 Å, c = 7.04 Å
Ratio:
a:b:c = 0.53 : 1 : 0.286
Unit Cell V:
2,266.38 ų (Calculated from Unit Cell)
Z:
1
Morphology:
platy
Comment:
Point Group: 2/m 2/m 2/m or mm2; Space Group: Pmmn or Pmn21

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0015364DelhayeliteCannillo E, Rossi G, Ungaretti L (1970) The crystal structure of delhayelite Rendiconti della Societa Italiana di Mineralogia e Petrologia 26 63-7519700293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.078 Å(100)
12.3 Å(35)
6.158 Å(25)
3.482 Å(10)
2.961 Å(5)
2.788 Å(5)
1.760 Å(5)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
35 : Ultra-alkali and agpaitic igneous rocks

Type Occurrence of DelhayeliteHide

Place of Conservation of Type Material:
Royal Museum for Central Africa, Tervuren, Belgium, RGM8037.
Associated Minerals at Type Locality:
Reference:
Sahama, T.G., Hytönen, K. (1959) Delhayelite, a new silicate from the Belgian Congo. Mineralogical Magazine: 32: 6-9.

Other Language Names for DelhayeliteHide

German:Delhayelit
Spanish:Delhayelita

Relationship of Delhayelite to other SpeciesHide

Member of:
Other Members of this group:
FivegiteK4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]ClOrth. mm2 : Pmn21
HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth. mm2
MelansoniteNa◻KZrSi8O19 · 5H2OOrth. mmm (2/m 2/m 2/m) : Pmma
Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
NatromelansoniteNa3Zr[Si7AlO19] · 4H2OMon. 2/m : P21/m
RhodesiteKHCa2Si8O19 · 5H2OOrth. mmm (2/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
9 photos of Delhayelite associated with AegirineNaFe3+Si2O6
3 photos of Delhayelite associated with Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
3 photos of Delhayelite associated with HisingeriteFe3+2(Si2O5)(OH)4 · 2H2O
2 photos of Delhayelite associated with MicroclineK(AlSi3O8)
1 photo of Delhayelite associated with CanasiteK3Na3Ca5Si12O30(OH)4
1 photo of Delhayelite associated with TitaniteCaTi(SiO4)O
1 photo of Delhayelite associated with FivegiteK4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]Cl
1 photo of Delhayelite associated with ZirconZr(SiO4)
1 photo of Delhayelite associated with VilliaumiteNaF
1 photo of Delhayelite associated with Lamprophyllite(Na,Mn2+)3(Sr,Na)2(Ti,Fe3+)3(Si2O7)2O2(OH,O,F)2

Related Minerals - Strunz-mindat GroupingHide

9.EB.NatromelansoniteNa3Zr[Si7AlO19] · 4H2OMon. 2/m : P21/m
9.EB.05MacdonalditeBaCa4Si16O36(OH)2 · 10H2OOrth.
9.EB.05RhodesiteKHCa2Si8O19 · 5H2OOrth. mmm (2/m 2/m 2/m)
9.EB.05MelansoniteNa◻KZrSi8O19 · 5H2OOrth. mmm (2/m 2/m 2/m) : Pmma
9.EB.10HydrodelhayeliteKCa2AlSi7O17(OH)2 · 6H2OOrth. mm2
9.EB.15Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
9.EB.20CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mbm
9.EB.20FluorcarletoniteKNa4Ca4Si8O18(CO3)4F · H2OTet.
9.EB.25Günterblassite(K,Ca,Ba)2(Fe,Ca,Mg,Na)[(Si,Al)13O25(OH)4] · 7H2O · Orth. mm2 : Pmn21
9.EB.25UmbrianiteK7Na2Ca2[Al3Si10O29]F2Cl2 Orth. mmm (2/m 2/m 2/m) : Pmmn
9.EB.25Hillesheimite(K,Ca,Ba,◻)2(Mg,Fe,Ca,◻)2[(Si,Al )13O23(OH)6](OH) · 8H2OOrth. mmm (2/m 2/m 2/m) : Pmmn
9.EB.30FivegiteK4Ca2[AlSi7O17(O2-xOHx)][(H2O)2-xOHx]ClOrth. mm2 : Pmn21

Fluorescence of DelhayeliteHide

Orange (from Khibiny, Russia)

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.

Internet Links for DelhayeliteHide

References for DelhayeliteHide

Localities for DelhayeliteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
DR Congo
 
  • North Kivu
    • Nyiragongo Territory
Richard +15 other references
Mineralogical Magazine (1959)
Italy
 
  • Umbria
    • Terni Province
      • San Venanzo
Sabatini (1899) +8 other references
Morocco
 
Berger et al. (2009)
Russia
 
  • Murmansk Oblast
    • Khibiny Massif
Pekov (1998)
Yakovenchuk et al. (2005)
[World of Stones 95:5-6
Pekov (1998)
Arzamastsev et al. (2008) +1 other reference
Pekov (1998) +1 other reference
        • Rasvumchorr Mine
Pavel Kartashov specimens. +3 other references
Pekov (1998)
Khomyakov et al. (1983) +1 other reference
Tanzania
 
  • Arusha region
    • Ngorongoro District
Dawson (1998)
 
Mineral and/or Locality  
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