Faheyite (original) (raw)

A valid IMA mineral species - grandfathered

About FaheyiteHide

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Formula:

Be2Mn2+Fe3+2(PO4)4 · 6H2O

Colour:

White, bluish-white, brownish-white

Lustre:

Sub-Vitreous, Silky

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

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1435:5

dcaf35fe-dca6-47a6-8e50-cb7677e63672

IMA Classification of FaheyiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Classification of FaheyiteHide

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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

Mineral SymbolsHide

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

Physical Properties of FaheyiteHide

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Colour:

White, bluish-white, brownish-white

Cleavage:

Perfect
Perfect // to c

Density:

2.66 g/cm3 (Measured) 2.670 g/cm3 (Calculated)

Optical Data of FaheyiteHide

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RI values:

_n_ω = 1.631 _n_ε = 1.652

δ = 0.021

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

Parallel

Pleochroism:

Non-pleochroic

Chemistry of FaheyiteHide

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Mindat Formula:

Be2Mn2+Fe3+2(PO4)4 · 6H2O

Crystallography of FaheyiteHide

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Class (H-M):

32 - Trapezohedral

Cell Parameters:

a = 9.404(7) Å, c = 15.920(11) Å

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

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of FaheyiteHide

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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

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Other Language Names for FaheyiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of FaheyiteHide

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Other InformationHide

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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

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References for FaheyiteHide

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Localities for FaheyiteHide

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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

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- 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.