Potassic-ferri-kaersutite
A named amphibole that is NOT (yet) an approved mineral species
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Formula:
KCa2(Mg3Fe3+Ti)(Si6Al2)O22O2
The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu
Potassic-ferri-kaersutite is defined with
A position: K dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu
Potassic-ferri-kaersutite is defined with
A position: K dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
Crystal System:
Monoclinic
Name:
For its relationship to Kaersutite
The chemical formula of kaersutite root nae group minerals have been changed in the 2012 amphibole nomenclature from {Na}{Ca2}{Mg4Ti}(Al2Si6O22)(OH)O to {Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2 thus adding WO > 1.0 apfu to the CTi > 0.5 apfu requirement to the definition of the mineral. The exact WO2-/(OH)- ratio is rarely analyzed and the amphibole report "use Ti content as a proxy for the oxo component in pargasite, and define kaersutite as having CTi >0.50 apfu (≈O2- > 1.00 apfu). However, if the O2- content is known from chemical or crystal-chemical analysis, it takes precedence over use of the Ti content as a proxy.
Unique Identifiers
Mindat ID:
56145
Long-form identifier:
mindat:1:1:56145:5
GUID
(UUID V4):
(UUID V4):
dadbc344-70fd-4eff-a1a9-74e0cbdaefda
IMA Classification of Potassic-ferri-kaersutite
IMA status notes:
Named Amphibole
First published:
2006
Chemistry of Potassic-ferri-kaersutite
Mindat Formula:
KCa2(Mg3Fe3+Ti)(Si6Al2)O22O2
The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu
Potassic-ferri-kaersutite is defined with
A position: K dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
The Kaersutite group minerals are WO2- dominant amphiboles defined with :
A(Na+K+2Ca)> 0.5 apfu,
B: Ca dominant
CTi > 0.5 apfu and
WO > 1.0 apfu
Potassic-ferri-kaersutite is defined with
A position: K dominant
C2+ position: Mg dominant
C3+ position: Fe dominant
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 40.48 % |
| TiO2 | 4.51 % |
| Al2O3 | 11.73 % |
| Cr2O3 | 0 % |
| FeO | 17.59 % |
| MnO | 0.47 % |
| MgO | 8.05 % |
| CaO | 9.33 % |
| Na2O | 2.81 % |
| K2O | 2.12 % |
| Total: | 97.09 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Elchuru Complex, Prakasam District, Coastal Andhra Region, Andhra Pradesh, India | Sample from nepheline syenite. |
Crystallography of Potassic-ferri-kaersutite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Relationship of Potassic-ferri-kaersutite to other Species
Other Members of this group:
| Ferri-kaersutite | NaCa2(Mg3Fe3+Ti)(Si6Al2O22)O2 | Mon. 2/m : B2/m |
| Ferro-kaersutite | NaCa2{Fe2+3AlTi}(Si6Al2O22)O2 | Mon. |
| Kaersutite | NaCa2(Mg3AlTi4+)(Si6Al2)O22O2 | Mon. 2/m : B2/m |
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 Potassic-ferri-kaersutite
mindat.org URL:
https://www.mindat.org/min-56145.html
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References for Potassic-ferri-kaersutite
Reference List:
Localities for Potassic-ferri-kaersutite
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.
India | |
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