Ferroefremovite
A valid IMA mineral species
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Formula:
(NH4)2Fe2+2(SO4)3
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.69
Crystal System:
Isometric
Member of:
Name:
Named for being the Fe analogue of efremovite.
Unique Identifiers
Mindat ID:
53673
Long-form identifier:
mindat:1:1:53673:2
GUID
(UUID V4):
(UUID V4):
8a562fb9-f23f-42b1-b679-90b76f51c14f
IMA Classification of Ferroefremovite
Approved
Approval year:
2019
First published:
2021
Classification of Ferroefremovite
7.AC.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
A : Sulfates (selenates, etc.) without additional anions, without H2O
C : With medium-sized and large cations
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 |
|---|---|---|
| Fefr | 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 Ferroefremovite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
None
Fracture:
Irregular/Uneven
Density:
2.69(1) g/cm3 (Measured) 2.700 g/cm3 (Calculated)
Optical Data of Ferroefremovite
Type:
Isotropic
RI values:
n = 1.574(3)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Chemistry of Ferroefremovite
Mindat Formula:
(NH4)2Fe2+2(SO4)3
Crystallography of Ferroefremovite
Crystal System:
Isometric
Class (H-M):
2 3 - Tetartoidal
Space Group:
P21 3
Cell Parameters:
a = 10.0484(9) Å
Unit Cell V:
1014.59 ų
Z:
4
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.80 Å | (40) |
| 4.50 Å | (20) |
| 4.11 Å | (30) |
| 3.17 Å | (100) |
| 3.02 Å | (20) |
| 2.68 Å | (50) |
| 1.86 Å | (18) |
| 1.62 Å | (18) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45a : [Sulfates, arsenates, selenates, antimonates] | |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Ferroefremovite
General Appearance of Type Material:
Cubic crystals up to 0.1 mm across.
Place of Conservation of Type Material:
collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18-2, Moscow 119071, Russia, registration number 5368/1
Geological Setting of Type Material:
Fumarole
Associated Minerals at Type Locality:
Reference:
Kasatkin A.V., Plášil J., Škoda R., Campostrini I., Chukanov N.V., Agakhanov A.A., Karpenko V.Y. and Belakovskiy D.I. (2021) Ferroefremovite, (NH4)2Fe2+2(SO4)3, a new mineral from Solfatara di Pozzuoli, Campania, Italy. The Canadian Mineralogist: 59(1): 59–68.
Synonyms of Ferroefremovite
Relationship of Ferroefremovite to other Species
Member of:
Other Members of this group:
| Calciolangbeinite | K2Ca2(SO4)3 | Iso. 2 3 : P21 3 |
| Efremovite | (NH4)2Mg2(SO4)3 | Iso. 2 3 : P21 3 |
| Langbeinite | K2Mg2(SO4)3 | Iso. 2 3 : P21 3 |
| Manganolangbeinite | K2Mn2(SO4)3 | Iso. 2 3 : P21 3 |
Related Minerals - Strunz-mindat Grouping
| 7.AC. | Aluminopyracmonite | (NH4)3Al(SO4)3 |
| 7.AC. | Amgaite | Tl+32Te6+O6 |
| 7.AC.05 | Vanthoffite | Na6Mg(SO4)4 |
| 7.AC.08 | Pyracmonite | (NH4)3Fe(SO4)3 |
| 7.AC.10 | Efremovite | (NH4)2Mg2(SO4)3 |
| 7.AC.10 | Langbeinite | K2Mg2(SO4)3 |
| 7.AC.10 | Manganolangbeinite | K2Mn2(SO4)3 |
| 7.AC.15 | Yavapaiite | KFe(SO4)2 |
| 7.AC.15 | Eldfellite | NaFe3+(SO4)2 |
| 7.AC.20 | Godovikovite | (NH4)Al(SO4)2 |
| 7.AC.20 | Sabieite | (NH4)Fe3+(SO4)2 |
| 7.AC.20 | Steklite | KAl(SO4)2 |
| 7.AC.35 | Aphthitalite | (K,Na)3Na(SO4)2 |
| 7.AC.35 | Möhnite | (NH4)K2Na(SO4)2 |
| 7.AC.35 | Belomarinaite | KNa(SO4) |
| 7.AC.35 | Natroaphthitalite | KNa3(SO4)2 |
| 7.AC.40 | Itelmenite | Na4Mg3Cu3(SO4)8 |
| 7.AC.45 | Saranchinaite | Na2Cu(SO4)2 |
| 7.AC.50 | Majzlanite | K2Na(ZnNa)Ca(SO4)4 |
| 7.AC.60 | Philoxenite | (K,Na,Pb)4(Na,Ca)2(Mg,Cu)3(Fe3+0.5Al0.5)(SO4)8 |
| 7.AC.75 | Petrovite | Na12Cu2(SO4)8 |
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 Ferroefremovite
mindat.org URL:
https://www.mindat.org/min-53673.html
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References for Ferroefremovite
Localities for Ferroefremovite
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.
Italy (TL) | |
| Kasatkin A.V. et al. (2021) |
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