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Faheyite

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Formula:
(Mn,Mg,Na)Be
 
2
Fe
 
2
(PO
 
4
)
 
4
· 6H
 
2
O
System:HexagonalColour:White, bluish-white, ...
Name:For US geochemist, John Joseph Fahey (1901-80).
This page provides mineralogical data about Faheyite.

Classification of Faheyite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.02-10
Nickel-Strunz 10th (pending) edition ID:8.CA.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
A : With small and large/medium cations
Dana 8th edition ID: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
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Type Occurrence of Faheyite

Type Locality:Sapucaia Mine (Proberil mine), Sapucaia do Norte, Galiléia, Doce valley, Minas Gerais, Brazil
General Appearance of Type Material:In vugs as white, bluishwhite, or brownish-white tufted fibers coating other minerals.
Year of Discovery:1952
Geological Setting of type material:A granite pegmatite
Associated Minerals at type locality:
QuartzMuscoviteVarisciteFrondelite

Physical Properties of Faheyite

Colour:White, bluish-white, brownish-white
Cleavage:Perfect
Perfect

Crystallography of Faheyite

Crystal System:Hexagonal
Cell Parameters:a = 9.43Å, c = 16Å
Ratio:a:c = 1 : 1.697
Unit Cell Volume:V 1,232.18 ų (Calculated from Unit Cell)
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.

Optical Data of Faheyite

Type:Uniaxial (+)
RI values: nω = 1.631 nε = 1.652
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate

Chemical Properties of Faheyite

Formula:
(Mn,Mg,Na)Be
 
2
Fe
 
2
(PO
 
4
)
 
4
· 6H
 
2
O
Essential elements:Be, Fe, H, Mn, O, P
All elements listed in formula:Be, Fe, H, Mg, Mn, Na, O, P
Common Impurities:Na

Relationship of Faheyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CA.05Fransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
8.CA.05Parafransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
8.CA.10Ehrleite
Ca
 
4
Be
 
3
Zn
 
2
(PO
 
4
)
 
6
· 9H
 
2
O
8.CA.20Gainesite
Na(Na,K)(Be,Li)Zr
 
2
(PO
 
4
)
 
4
· 1.5-2H
 
2
O
8.CA.20Mccrillisite
NaCs(Be,Li)Zr
 
2
(PO
 
4
)
 
4
· 1-2H
 
2
O
8.CA.20Selwynite
NaK(Be,Al)Zr
 
2
(PO
 
4
)
 
4
· 2H
 
2
O
8.CA.25Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
· 38H
 
2
O
8.CA.30Hopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
8.CA.30Arsenohopeite
Zn
 
3
(AsO
 
4
)
 
2
· 4H
 
2
O
8.CA.35Warikahnite
Zn
 
3
(AsO
 
4
)
 
2
· 2H
 
2
O
8.CA.40Phosphophyllite
Zn
 
2
Fe(PO
 
4
)
 
2
· 4H
 
2
O
8.CA.45Parascholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
8.CA.45Scholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
8.CA.50Keyite
Cu
2+
3
Zn
 
4
Cd
 
2
(AsO
 
4
)
 
6
· 2H
 
2
O
8.CA.55Pushcharovskite
K
 
0.6
Cu
 
18
(AsO
 
4
)(HAsO
 
4
)
 
10
(H
 
2
AsO
 
4
)
 
4
(OH)
 
9.6
·18.6H
 
2
O
8.CA.60Prosperite
CaZn
 
2
(AsO
 
4
)(HAsO
 
4
)(OH)
8.CA.65Gengenbachite
KFe
3+
3
(HPO
 
4
)
 
4
(H
 
2
PO
 
4
)
 
2
· 6H
 
2
O
8.CA.70Parahopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.3.1Moraesite
Be
 
2
(PO
 
4
)(OH) · 4H
 
2
O
19.3.2Beryllonite
NaBePO
 
4
19.3.3Hurlbutite
CaBe
 
2
(PO
 
4
)
 
2
19.3.4Hydroxylherderite
CaBe(PO
 
4
)(OH,F)
19.3.5Glucine
CaBe
 
4
(PO
 
4
)
 
2
(OH)
 
4
· 0.5H
 
2
O
19.3.6Fransoletite
Ca
 
3
Be
 
2
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
· 4H
 
2
O
19.3.7Uralolite
Ca
 
2
Be
 
4
(PO
 
4
)
 
3
(OH)
 
3
· 5H
 
2
O
19.3.9Pahasapaite
Li
 
8
(Ca,Li,K)
 
10.5
Be
 
24
(PO
 
4
)
 
24
· 38H
 
2
O
19.3.10Tiptopite
K
 
2
(Na,Ca)
 
2
Li
 
3
Be
 
6
(PO
 
4
)
 
6
(OH)
 
2
· H
 
2
O
19.3.11Gainesite
Na(Na,K)(Be,Li)Zr
 
2
(PO
 
4
)
 
4
· 1.5-2H
 
2
O
19.3.12Roscherite
Ca
 
2
Mn
2+
5
Be
 
4
(PO
 
4
)
 
6
(OH)
 
4
· 6H
 
2
O
19.3.14Farringtonite
Mg
 
3
(PO
 
4
)
 
2
19.3.15Holtedahlite
Mg
 
2
(PO
 
4
)(OH)
19.3.16Althausite
Mg
 
2
(PO
 
4
)(OH,F)
19.3.17Newberyite
Mg(HPO
 
4
) · 3H
 
2
O
19.3.18Phosphorrösslerite
Mg(HPO
 
4
) · 7H
 
2
O
19.3.19Bobierrite
Mg
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
19.3.20Barićite
(Mg,Fe)
 
3
(PO
 
4
)
 
2
· 8H
 
2
O
19.3.21Panethite
(Na,Ca)
 
2
(Mg,Fe
2+
 
)
 
2
(PO
 
4
)
 
2
19.3.22Dittmarite
(NH
 
4
)Mg(PO
 
4
) · H
 
2
O
19.3.23Struvite
(NH
 
4
)Mg(PO
 
4
) · 6H
 
2
O
19.3.24Hannayite
(NH
 
4
)
 
2
Mg
 
3
H
 
4
(PO
 
4
)
 
4
· 8H
 
2
O

Other Names for Faheyite

Synonyms:
Faheylite
Other Languages:
German:Faheyit
Faheylit
Spanish:Faheyita
Faheylita

Other Information

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

References for Faheyite

Reference List:

- +
Lindberg & Murata (1953): Faheyite, a new phosphate mineral from the Sapucaia pegmatite mine, Minas Gerais, Brazil. American Mineralogist. 38, 263-270, 349.

American Mineralogist (1964): 49: 395.

Internet Links for Faheyite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Faheyite details from Handbook of Mineralogy (PDF)
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  • Localities for Faheyite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Brazil
     
    • Minas Gerais
      • Doce valley
        • 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 Province
      • Namaqualand
        • 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 District
          • Custer
    Robinson et al.: Miner. Rec. 23:423-437 (1992)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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