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Faheyite

A valid IMA mineral species - grandfathered
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06537590014946659435720.jpg
Faheyite

Roosevelt group, Custer, Custer Mining District, Custer County, South Dakota, USA
00987220014977341209863.jpg
Faheyite

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
00070170014958886879640.jpg
Faheyite

Roosevelt group, Custer, Custer Mining District, Custer County, South Dakota, USA
06537590014946659435720.jpg
Faheyite

Roosevelt group, Custer, Custer Mining District, Custer County, South Dakota, USA
02778530014946659492944.jpg
Faheyite

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
04353550014948802217265.jpg
Faheyite

Roosevelt group, Custer, Custer Mining District, Custer County, South Dakota, USA
06537590014946659435720.jpg
Faheyite

Roosevelt group, Custer, Custer Mining District, Custer County, South Dakota, USA
02778530014946659492944.jpg
Faheyite

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
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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 1953 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


Unique IdentifiersHide

Mindat ID:
1435
Long-form identifier:
mindat:1:1:1435:5
GUID
(UUID V4):
dcaf35fe-dca6-47a6-8e50-cb7677e63672

IMA Classification of FaheyiteHide

IMA status:
Approved, 'Grandfathered' (first described prior to 1959)

Classification of FaheyiteHide

Strunz-mindat (2024):
8.CA.15

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
Hey's CIM Ref.:
19.3.13

19 : Phosphates
3 : Phosphates of Be and Mg

Mineral SymbolsHide

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

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

Physical Properties of FaheyiteHide

Lustre:
Sub-Vitreous, Silky
Transparency:
Transparent
Colour:
White, bluish-white, brownish-white
Streak:
White
Hardness:
3 on Mohs scale
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

Chemistry of FaheyiteHide

Mindat Formula:
Be2Mn2+Fe3+2(PO4)4 · 6H2O
Elements listed:
Be, Fe, H, Mn, O, P - search for minerals with similar chemistry
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

Geological EnvironmentHide

Type Occurrence of FaheyiteHide

Type Locality:
ⓘ Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
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:
VarisciteRoscheriteQuartzMuscoviteFrondelite

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 - Strunz-mindat 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(PO3OH)2 · 4H2OMon. 2/m : P21/b
8.CA.05ParafransoletiteCa3Be2(PO4)2(PO3OH)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. 4/mmm (4/m 2/m 2/m) : I41/amd
8.CA.25PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2OIso. 2 3 : I2 3
8.CA.30HopeiteZnZn2(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.30NizamoffiteMn2+Zn2(PO4)2(H2O)4Orth. mmm (2/m 2/m 2/m) : Pbcm
8.CA.30Unnamed (Mg-analogue of Hopeite)Mg3(PO4)2 · 4H2O
8.CA.35WarikahniteZn3(AsO4)2 · 2H2OTric. 1 : P1
8.CA.40PhosphophylliteZn2Fe(PO4)2 · 4H2OMon. 2/m : P21/b
8.CA.42SteinmetziteZn2Fe3+(PO4)2(OH) · 3H2OTric. 1 : P1
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[AsO2(OH)2]4[AsO3OH]10(AsO4)(OH)9.6 · 18.6H2OTric.
8.CA.60ProsperiteCa2Zn4(AsO4)4 · H2OMon.
8.CA.65GengenbachiteKFe3+3(PO3OH)4[PO2(OH)2]2 · 6H2OTrig. 3m : P3 1c
8.CA.70ParahopeiteZn3(PO4)2 · 4H2OTric. 1 : P1
8.CA.70ReaphookhilliteMgZn2(PO4)2 · 4H2OTric. 1 : P1
8.CA.75StergiouiteCaZn2(AsO4)2 · 4H2OMon. m : Pb
8.CA.80LimousiniteBaCa[Be4P4O16] · 6H2OMon. 2/m : P21/b
8.CA.85MinjiangiteBaBe2(PO4)2Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
8.CA.85Wilancookite(Ba5Li2◻)Ba6Be24P24O96 · 26H2OIso. 2 3 : I2 3

Fluorescence of FaheyiteHide

In UV light:
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.

Internet Links for FaheyiteHide

References 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 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.
Brazil (TL)
 
  • Minas Gerais
    • Galiléia
      • Sapucaia do Norte
Rocks & Minerals: 62: 318. +1 other reference
South Africa
 
  • Northern Cape
    • Namakwa District Municipality
      • Nama Khoi Local Municipality
        • Steinkopf
O. von Knorring: "Some mineralogical et al. (1985)
USA
 
  • South Dakota
    • Custer County
      • Custer Mining District
        • Custer
Robinson et al.: Miner. Rec. 23:423-437 (1992)
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