Ferrotaaffeite-6N'3S
A valid IMA mineral species
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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
Member of:
Name:
Originally named and described as Pehrmanite by Burke & Lustenhouwer (1981) from Rosendal pegmatite, Kemiö Island, Finland.
Unique Identifiers
Mindat ID:
3142
Long-form identifier:
mindat:1:1:3142:0
Similar Names
| Ferrotaaffeite-2N’2S | A valid IMA mineral species | Be(Fe,Mg,Zn)3Al8O16 |
IMA Classification of Ferrotaaffeite-6N'3S
Classification of Ferrotaaffeite-6N'3S
4.00.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
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
7 : MULTIPLE OXIDES
2 : AB2X4
16.6.8
16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
16 : Silicates Containing Aluminum and other Metals
6 : Aluminosilicates of Be
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ftf-6N'3S | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ferrotaaffeite-6N'3S
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'3S
Type:
Uniaxial (-)
Chemistry of Ferrotaaffeite-6N'3S
Mindat Formula:
(Be,Zn,Mg)FeAl4O8
Element Weights:
Crystallography of Ferrotaaffeite-6N'3S
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.56 Å | (20) |
| 3.15 Å | (30) |
| 2.856 Å | (80) |
| 2.666 Å | (40) |
| 2.529 Å | (30) |
| 2.422 Å | (100) |
| 1.492 Å | (30) |
| 1.426 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Ferrotaaffeite-6N'3S
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.
nigerite.
Geological Setting of Type Material:
Granite pegmatite dyke in a hornblende gabbro.
Associated Minerals at Type Locality:
Synonyms of Ferrotaaffeite-6N'3S
Other Language Names for Ferrotaaffeite-6N'3S
Dutch:Ferrotaaffeiet-6N'3S
German:Ferrotaaffeit-6N'3S
Pehrmanit
Pehrmanit
Russian:Ферротаафеит-6N'3S
Spanish:Pehrmanita
Relationship of Ferrotaaffeite-6N'3S to other Species
Member of:
Other Members of Ferrotaaffeite subgroup:
| Ferrotaaffeite-2N’2S | Be(Fe,Mg,Zn)3Al8O16 | Hex. 6mm : P63mc |
Related Minerals - Strunz-mindat Grouping
| 4.00. | Mapiquiroite | (Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38 |
| 4.00. | 'UM2004-19-O:AlCeGdZr' | (Gd,Ce)4Al2Zr4O17 |
| 4.00. | Almeidaite | PbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O) |
| 4.00. | Vapnikite | Ca2CaUO6 |
| 4.00. | Microlite Group | A2-mTa2X6-wZ1-n |
| 4.00. | 'UM2004-21-O:CaFeGdZr' | Ca2Gd4Fe5ZrO15 |
| 4.00. | 'UM2004-27-O:GdTi' | Gd2Ti4O11 |
| 4.00. | Písekite-(Y) | (Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4 |
| 4.00. | Pyrochlore Group | A2Nb2(O,OH)6Z |
| 4.00.20 | Yttrotungstite-(Nd) | NdW2O7(OH) · H2O |
| 4.00.25 | Heisenbergite | U6+O2(OH)2 · H2O |
Other Information
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 Ferrotaaffeite-6N'3S
mindat.org URL:
https://www.mindat.org/min-3142.html
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References for Ferrotaaffeite-6N'3S
Reference List:
Localities for Ferrotaaffeite-6N'3S
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Finland (TL) | |
| Burke et al. (1981) |
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