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Ferrotaaffeite-6N'3S

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Formula:
(Be,Zn,Mg)FeAl4O8
Colour:
Light green
Lustre:
Vitreous
Hardness:
8 - 8½
Specific Gravity:
4.07 (Calculated)
Crystal System:
Trigonal
Name:
Originally named and described as Pehrmanite by Burke & Lustenhouwer (1981) from Rosendal pegmatite, Kemiö Island, Finland.
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Classification of Ferrotaaffeite-6N'3SHide

Approved
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
7.2.12.2

7 : MULTIPLE OXIDES
2 : AB2X4
16.6.8

16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be

Physical Properties of Ferrotaaffeite-6N'3SHide

Vitreous
Colour:
Light green
Streak:
White
Hardness:
8 - 8½ on Mohs scale
Tenacity:
Very brittle
Cleavage:
None Observed
Density:
4.07 g/cm3 (Calculated)
Comment:
Calculated using the empirical formula and unit-cell dimensions

Optical Data of Ferrotaaffeite-6N'3SHide

Type:
Uniaxial (-)

Chemical Properties of Ferrotaaffeite-6N'3SHide

Formula:
(Be,Zn,Mg)FeAl4O8
IMA Formula:
BeFe2+2Al6O12

Crystallography of Ferrotaaffeite-6N'3SHide

Crystal System:
Trigonal
Cell Parameters:
a = 5.7 Å, c = 41.16 Å
Ratio:
a:c = 1 : 7.221
Unit Cell V:
1,158.13 ų (Calculated from Unit Cell)
Morphology:
tabular

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.56(20)
3.15(30)
2.856(80)
2.666(40)
2.529(30)
2.422(100)
1.492(30)
1.426(50)

Type Occurrence of Ferrotaaffeite-6N'3SHide

General Appearance of Type Material:
Small, subhedral hexagonal tabular crystals up to 25O pm across and 40 u,m thick, and as oriented overgrowths on
nigerite.
Geological Setting of Type Material:
Granite pegmatite dyke in a hornblende gabbro.
Associated Minerals at Type Locality:

Synonyms of Ferrotaaffeite-6N'3SHide

Other Language Names for Ferrotaaffeite-6N'3SHide

Relationship of Ferrotaaffeite-6N'3S to other SpeciesHide

Other Members of this group:
Ferrotaaffeite-2N’2SBe(Fe,Mg,Zn)3Al8O16 Hex. 6mm : P63mc
Magnesiotaaffeite-2N’2SMg3Al8BeO16Hex. 6/mmm (6/m 2/m 2/m)
Magnesiotaaffeite-2N’2S2Mg3BeAl8O16Trig. 3m (3 2/m) : P3m1
Magnesiotaaffeite-6N’3SMg2BeAl6O12Trig.

Related Minerals - Nickel-Strunz GroupingHide

4.00.Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
4.00.Microlite GroupIso. m3m (4/m 3 2/m) : Fd3m
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group
4.00.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.00.Písekite-(Y)(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
4.00.UM2004-19-O:AlCeGdZr(Gd,Ce)4Al2Zr4O17
4.00.UM2004-21-O:CaFeGdZrCa2Gd4Fe5ZrO15
4.00.UM2004-27-O:GdTiGd2Ti4O11
4.00.Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
4.00.AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
4.00.VapnikiteCa2CaUO6Mon. 2/m

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

7.2.12.1Magnesiotaaffeite-6N’3SMg2BeAl6O12Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.6.1BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.2EuclaseBeAl(SiO4)(OH)Mon. 2/m : P21/b
16.6.3BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
16.6.4AminoffiteCa2(Be,Al)(Si2O7)(H2O,OH)Tet.
16.6.5MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
16.6.6LovdariteK2Na6Be4Si14O36 · 9H2OOrth. mm2
16.6.7Surinamite(Mg,Fe)3Al4BeSi3O16Mon.

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 Ferrotaaffeite-6N'3SHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Burke, E. A. J. & Lustenhouwer, W. J. (1981): Pehrmanite, a new beryllium mineral from Rosendal pegmatite, Kemio Island, southwestern Finland. Canadian Mineralogist, 19, 311-314. [Pehrmanite was former name of ferrotaafeeite-6N'3S].
European Journal of Mineralogy: 14: 389-395.

Internet Links for Ferrotaaffeite-6N'3SHide

Localities for Ferrotaaffeite-6N'3SHide

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.
Finland (TL)
 
  • Southwestern Finland Region
    • Kemiö Island (Kimito Island)
Burke, E. A. J. and Lustenhouwer, W. J. (1981): Pehrmanite, a new beryllium mineral from Rosendal Pegmatite, Kemio Island, southwestern Finland. Canadian Mineralogist. 19, 311-314
Mineral and/or Locality  
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