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Eylettersite

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About EylettersiteHide

Lea Eyletters and L. Van Wambeke
Formula:
Th0.75Al3(PO4)2(OH)6
The type material contains minor Pb replacing Th, and minor Si replacing P.
Colour:
Cream white
Lustre:
Vitreous
Hardness:
3 - 4
Crystal System:
Trigonal
Name:
Named in 1972 by L. Van Wambeke after his wife, Lea Eyletters.
This page provides mineralogical data about Eylettersite.


Classification of EylettersiteHide

Approved
First Published:
1972
7/B.36-100
8.BL.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
41.5.12.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
17.6.17

17 : Silicates Containing other Anions
6 : Silicates with phosphate

Physical Properties of EylettersiteHide

Vitreous
Colour:
Cream white
Streak:
White
Hardness:
3 - 4 on Mohs scale

Optical Data of EylettersiteHide

Type:
Uniaxial (-)
RI values:
nε = 1.615 - 1.660
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of EylettersiteHide

Formula:
Th0.75Al3(PO4)2(OH)6

The type material contains minor Pb replacing Th, and minor Si replacing P.
IMA Formula:
Th0.75Al3(PO4)2(OH)6

Crystallography of EylettersiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 6.99 Å, c = 16.7 Å
Ratio:
a:c = 1 : 2.389
Unit Cell V:
706.65 ų (Calculated from Unit Cell)

Type Occurrence of EylettersiteHide

Place of Conservation of Type Material:
Euratom, Ispra, Italy
Reference:
van Wambeke, L. (1972) Eylettersite, un nouveau phosphate de thorium appartenant à la série de la crandallite. Bulletin de la Société Française de Minéralogie et de Cristallographie: 95: 98-105.

Synonyms of EylettersiteHide

Other Language Names for EylettersiteHide

Relationship of Eylettersite to other SpeciesHide

Other Members of this group:
BenauiteSrFe3+3(HPO4,PO4)2(OH)6Trig. 3m (3 2/m) : R3m
CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
Florencite-(Ce)CeAl3(PO4)2(OH)6
Florencite-(La)LaAl3(PO4)2(OH)6
Florencite-(Nd)NdAl3(PO4)2(OH)6
Florencite-(Sm)SmAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
GalloplumbogummitePb(Ga,Al,Ge)3(PO4)2(OH)6Trig. 3m : R3m
GorceixiteBaAl3(PO4)(PO3OH)(OH)6Mon. m : Bm
GoyaziteSrAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
KintoreitePbFe3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
Kintoreite-2cPbFe3+3(PO4)2(OH,H2O)6
PlumbogummitePbAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
SpringcreekiteBaV3+3(PO4)2(OH,H2O)6Trig. 3m (3 2/m) : R3m
Unnamed (As-analogue of Zaïrite)(Bi,Pb)Fe3+3(AsO4)2(OH)6
WaylanditeBiAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
ZaïriteBiFe3+3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m

Related Minerals - Nickel-Strunz GroupingHide

8.BL.05BeudantitePbFe3(AsO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.05CorkitePbFe3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.05HidalgoitePbAl3(AsO4)(SO4)(OH)6Trig.
8.BL.05HinsdalitePbAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.05KemmlitziteSrAl3(AsO4)(SO4)(OH)6Trig.
8.BL.05SvanbergiteSrAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.05WoodhouseiteCaAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.05GallobeudantitePbGa3(AsO4)(SO4)(OH)6Trig.
8.BL.10ArsenogoyaziteSrAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10ArsenogorceixiteBaAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10ArsenocrandalliteCaAl3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m)
8.BL.10BenauiteSrFe3+3(HPO4,PO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10DussertiteBaFe3+3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10GorceixiteBaAl3(PO4)(PO3OH)(OH)6Mon. m : Bm
8.BL.10GoyaziteSrAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10KintoreitePbFe3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10PhilipsbornitePbAl3(AsO4)(AsO3OH)(OH)6Trig.
8.BL.10PlumbogummitePbAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10SegnititePbFe3+3AsO4(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
8.BL.10SpringcreekiteBaV3+3(PO4)2(OH,H2O)6Trig. 3m (3 2/m) : R3m
8.BL.13Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.13Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6Trig.
8.BL.13Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.13Florencite-(Ce)CeAl3(PO4)2(OH)6
8.BL.13Florencite-(La)LaAl3(PO4)2(OH)6
8.BL.13Florencite-(Nd)NdAl3(PO4)2(OH)6
8.BL.13WaylanditeBiAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.13ZaïriteBiFe3+3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.13ArsenowaylanditeBiAl3(AsO4)2(OH)6Trig.
8.BL.13Graulichite-(Ce)CeFe3+3(AsO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.13Florencite-(Sm)SmAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
8.BL.15ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3Mon.
8.BL.25PattersonitePbFe3+3(PO4)2(OH)5 · H2OTric. 1 : P1

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

41.5.12.1WaylanditeBiAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
41.5.12.3ZaïriteBiFe3+3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.6.1NagelschmidtiteCa7(SiO4)2(PO4)2Hex. 6 : P61
17.6.2PerhamiteCa3Al7.7Si3P4O23.5(OH)14.1 · 8H2OTrig. 3m (3 2/m) : P3m1
17.6.3Viséite
17.6.4PhosinaiteNa13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4
17.6.5ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4Mon.
17.6.6Karnasurtite-(Ce)(Ce,La,Th)(Ti,Nb)(Al,Fe)(Si2O7)(OH)4 · 3H2O
17.6.7LomonosoviteNa5Ti2(Si2O7)(PO4)O2Tric.
17.6.8BornemaniteNa6BaTi2Nb(Si2O7)2(PO4)O2(OH)F Tric. 1 : P1
17.6.9SoboleviteNa13Ca2Mn2Ti3(Si2O7)2(PO4)4O3F3Mon. m : Pb
17.6.10Laplandite-(Ce)Na4CeTiPO4Si7O18 · 5H2O
17.6.11 VunonnemiteNa5TiNb3Si6O25F2 · 2Na3PO4
17.6.12Saryarkite-(Y)Ca(Y,Th)Al5(SiO4)2(PO4,SO4)2(OH)7 · 6H2OTet. 4 2 2
17.6.13Steenstrupine-(Ce)Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2 · 2H2OTrig.
17.6.14WaylanditeBiAl3(PO4)2(OH)6Trig. 3m (3 2/m) : R3m
17.6.15Britholite-(Ce)(Ce,Ca)5(SiO4)3OHHex. 6/m : P63/m
17.6.16Britholite-(Y)(Y,Ca)5(SiO4)3OHHex. 6/m : P63/m

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 EylettersiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
van Wambeke, L. (1971) The problem of cation deficiencies in some phosphates due to alteration processes. American Mineralogist: 56: 1366-1384.
van Wambeke, L. (1972) Eylettersite, un nouveau phosphate de thorium appartenant à la série de la crandallite. Bulletin de la Société Française de Minéralogie et de Cristallographie: 95: 98-105.
Fleischer, M. (1974) New mineral names. American Mineralogist: 59: 208-212.
Jambor, J.L. (1999) Nomenclature of the alunite supergroup. The Canadian Mineralogist: 37: 1323-1341.
Bayliss, P., Kolitsch, U., Nickel, E.H., Pring, A. (2010) Alunite supergroup: recommended nomenclature. Mineralogical Magazine: 74: 919-927.

Internet Links for EylettersiteHide

Localities for EylettersiteHide

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.
Democratic Republic of the Congo (TL)
 
  • Sud-Kivu
    • Mwenga
Bull. Soc. fr. Minéral. (1972) 95, 98–105; HB4 (2000)
Namibia
 
  • Erongo Region
    • Karibib
E. Schnaitmann, F. Brandstätter, U. Kolitsch and G. Niedermayr (2008): Die „Gitterquarz“-Paragenese aus dem Erongo, Namibia. Mineralien-Welt 20 (1), 55-63.
Mineral and/or Locality  
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