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Faheyite

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About FaheyiteHide

01534410014946659555756.jpg
Joseph John Fahey
Formula:
Be2Mn2+Fe3+2(PO4)4 · 6H2O
Colour:
White, bluish-white, brownish-white
Lustre:
Sub-Vitreous, Silky
Hardness:
3
Specific Gravity:
2.66
Crystal System:
Trigonal
Name:
Named in 1952 by Marie Louise Lindberg (Smith) and Kiguma Jack Murata in honor of Joseph John Fahey [July 30, 1901 Messina, New York, USA - June 29, 1980 Adelphi, Maryland, USA], mineral chemist at the U. S. Geological Survey, Menlo Park, California, USA. Fahey named several minerals including bradleyite, edgarbaileyite, and wherryite
White silky needles


Classification of FaheyiteHide

Approved, 'Grandfathered' (first described prior to 1959)
8.CA.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
40.5.3.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
19.3.13

19 : Phosphates
3 : Phosphates of Be and Mg

Physical Properties of FaheyiteHide

Sub-Vitreous, Silky
Transparency:
Transparent
Colour:
White, bluish-white, brownish-white
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
Perfect // to c
Fracture:
Splintery
Density:
2.66 g/cm3 (Measured)    2.670 g/cm3 (Calculated)

Optical Data of FaheyiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.631 nε = 1.652
Birefringence:
0.020
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of FaheyiteHide

Formula:
Be2Mn2+Fe3+2(PO4)4 · 6H2O
Common Impurities:
Na

Crystallography of FaheyiteHide

Crystal System:
Trigonal
Class (H-M):
3 2 - Trapezohedral
Space Group:
P31 2 1
Cell Parameters:
a = 9.404(7) Å, c = 15.920(11) Å
Ratio:
a:c = 1 : 1.693
Unit Cell V:
1219 ų
Z:
3
Morphology:
Individual fibers of faheyite average about 0.08 mm. in length and 0.01 mm. in thickness. The singly fibers may be terminated by pyramid faces.
Comment:
Previously thought to have space group P6322.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.28 Å(90)
5.72 Å(100)
3.96 Å(50)
3.24 Å(60)
3.09 Å(60)
3.03 Å(60)
2.72 Å(30)
2.67 Å(30)
Comments:
ICDD 6-109

Type Occurrence of FaheyiteHide

General Appearance of Type Material:
In vugs as white, bluish white, or brownish white tufted fibers coating other minerals.
Geological Setting of Type Material:
Late-stage phosphate mineralization in granite pegmatite
Associated Minerals at Type Locality:

Synonyms of FaheyiteHide

Other Language Names for FaheyiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Faheyite associated with StrengiteFePO4 · 2H2O
1 photo of Faheyite associated with MuscoviteKAl2(AlSi3O10)(OH)2

Related Minerals - Nickel-Strunz GroupingHide

8.CA.DavidlloyditeZn3(AsO4)2·4H2O Tric. 1 : P1
8.CA.ApexiteNaMg(PO4)·9H2OTric. 1 : P1
8.CA.BrandãoiteBeAl2(PO4)2(OH)2(H2O)5Tric. 1 : P1
8.CA.05FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OMon.
8.CA.05ParafransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OTric. 1 : P1
8.CA.10EhrleiteCa4Be3Zn2(PO4)6 · 9H2OTric. 1 : P1
8.CA.20GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
8.CA.20MccrillisiteNaCs(Be,Li)Zr2(PO4)4 · 1-2H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.20SelwyniteNaK(Be,Al)Zr2(PO4)4 · 2H2OTet.
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZn3(PO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.30ArsenohopeiteZn3(AsO4)2 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.45ParascholziteCaZn2(PO4)2 · 2H2OMon.
8.CA.45ScholziteCaZn2(PO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.50KeyiteCu2+3Zn4Cd2(AsO4)6 · 2H2OMon. 2/m
8.CA.55PushcharovskiteK0.6Cu18(AsO4)(HAsO4)10(H2AsO4)4(OH)9.6·18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(HPO4)4(H2PO4)2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.3.1MoraesiteBe2(PO4)(OH) · 4H2OMon.
19.3.2BerylloniteNaBePO4Mon. 2/m : P21/b
19.3.3HurlbutiteCaBe2(PO4)2Mon.
19.3.4HydroxylherderiteCaBe(PO4)(OH,F)Mon. 2/m : P21/b
19.3.5GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
19.3.6FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2OMon.
19.3.7UraloliteCa2Be4(PO4)3(OH)3 · 5H2OMon.
19.3.9PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
19.3.10TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2OHex.
19.3.11GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2OTet. 4mm : I41md
19.3.12RoscheriteCa2Mn2+5Be4(PO4)6(OH)4 · 6H2OMon. 2/m : B2/m
19.3.14FarringtoniteMg3(PO4)2Mon. 2/m
19.3.15HoltedahliteMg2(PO4)(OH)Trig. 3m : P3 1m
19.3.16AlthausiteMg4(PO4)2(OH,O)(F,☐)Orth. mmm (2/m 2/m 2/m) : Pnma
19.3.17NewberyiteMg(HPO4) · 3H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.3.18PhosphorrössleriteMg(HPO4) · 7H2OMon. 2/m : P2/b
19.3.19BobierriteMg3(PO4)2 · 8H2OMon. 2/m : B2/b
19.3.20Barićite(Mg,Fe)3(PO4)2 · 8H2OMon. 2/m : B2/m
19.3.21Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2Mon. 2/m : P21/b
19.3.22Dittmarite(NH4)Mg(PO4) · H2OOrth.
19.3.23Struvite(NH4)Mg(PO4) · 6H2OOrth. mm2
19.3.24Hannayite(NH4)2Mg3H4(PO4)4 · 8H2OTric. 1 : P1

Fluorescence of FaheyiteHide

Not fluorescent

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 FaheyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Lindberg, M. L. & Murata, K. J. (1953): Faheyite, a new phosphate mineral from the Sapucaia pegmatite mine, Minas Gerais, Brazil. American Mineralogist 38, 263-270, 349.
Lindberg, M. L. (1964): Mineralogical notes: Crystallography of faheyite, Sapucaia pegmatite mine, Minas Gerais, Brazil. American Mineralogist 49, 395-398.
Cooper, M. A. & Hawthorne, F. C. (2015): The crystal structure of faheyite, Mn2+Fe3+2[Be2(PO4)4](H2O)6: a new twist for the [Be(PΦ4)2] chain. Canadian Mineralogist 53, 199-208.

Internet Links for FaheyiteHide

Localities for FaheyiteHide

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.
Brazil (TL)
 
  • Minas Gerais
    • Galiléia
      • Sapucaia do Norte
Lindberg & Murata (1953): Faheyite, a new phosphate mineral from the Sapucaia pegmatite mine, Minas Gerais, Brazil. American Mineralogist. 38, 263-270, 349; Rocks & Minerals: 62: 318.
South Africa
 
  • Northern Cape
    • Namakwa
      • Steinkopf
O. von Knorring: "Some mineralogical, geochemical and economic aspects of lithium pegmatites from the Karibib-Cape-Cross pegmatite field in South West Africa/Namibia", Commun. Geol. Surv. SW Africa/Namibia 1:79-84 (1985)
USA
 
  • South Dakota
    • Custer Co.
      • Custer Mining District
        • Custer
Robinson et al.: Miner. Rec. 23:423-437 (1992)
 
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