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Potassic-ferro-sadanagaite
A valid IMA mineral species
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About Potassic-ferro-sadanagaite
Formula:
KCa2(Fe2+3Al2)(Al3Si5O22)(OH)2
The sadanagaite group minerals are defined as with 0.5 < A(Na+K+ 2Ca) where Na or K is dominant, and with 1.5 < C(Al+Fe3++2Ti), where Al or Fe3+ are dominant. The W position may contain (OH),F or Cl.
Potassic-ferro-sadanagaite is defined with
A position: K dominant
C2+ position: Fe dominant
C3+ position: Al dominant
W position: (OH) dominant
Potassic-ferro-sadanagaite is defined with
A position: K dominant
C2+ position: Fe dominant
C3+ position: Al dominant
W position: (OH) dominant
Lustre:
Vitreous
Crystal System:
Monoclinic
Member of:
Name:
This material was originally described as "Sadanagaite" (IMA1980-027)by Shimazaki et.al(1984), but due to redefinitions in the IMA amphibole nomenclature in 1997 and 2012, the name of this material has changed via potassic-sadanagaite (1997-2012) to potassic-ferro-sadanagaite (2012- ).
Type Locality:
This page provides mineralogical data about Potassic-ferro-sadanagaite.
Unique Identifiers
Mindat ID:
7248
Long-form identifier:
mindat:1:1:7248:5
Similar Names
| Potassic-ferri-sadanagaite | A named amphibole that is NOT (yet) an approved mineral species | KCa2(Mg3Fe23+)(Al3Si5O22)(OH)2 |
IMA Classification of Potassic-ferro-sadanagaite
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
KCa2(Fe2+3Al2)(Si5Al3)O22(OH)2
Approval history:
Redefined: IMA 2012 s.p.
Classification of Potassic-ferro-sadanagaite
9.DE.15
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
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 |
|---|---|---|
| Pfsdg | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Birkhin gabbro massif, Narin-Kunta, Irkutsk Oblast, Russia