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
GUID
(UUID V4):
(UUID V4):
efe88373-96db-4c30-a113-7ac5d9364616
IMA Classification of Ferrotaaffeite-6N'3S
Approved
IMA Formula:
BeFe2+2Al6O12
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 |
---|---|---|
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
Crystallography of Ferrotaaffeite-6N'3S
Crystal System:
Trigonal
Class (H-M):
3m (3 2/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
Relationship of Ferrotaaffeite-6N'3S to other Species
Related Minerals - Strunz-mindat Grouping
4.00. | Goethite | α-Fe3+O(OH) |
4.00. | Microlite Group | A2-mTa2X6-wZ-n |
4.00. | Pyrochlore Group | A2Nb2(O,OH)6Z |
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:CaFeGdZr | Ca2Gd4Fe5ZrO15 |
4.00. | UM2004-27-O:GdTi | Gd2Ti4O11 |
4.00. | Mapiquiroite | (Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38 |
4.00. | Almeidaite | PbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O) |
4.00. | Vapnikite | Ca2CaUO6 |
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
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).
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.
All localities listed without proper references should be considered as questionable.
Finland (TL) | |
| Burke et al. (1981) |
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