The hastingsite-group minerals are defined with 0.5 < A(Na+K+2Ca) < 1.5 where Na or K is dominant and with the C position occupied by Mg or Fe2+ as dominant divalent ions and 0.5 < C(Al+Fe3+ +2Ti) < 1.5 where Fe3+ is dominant. W may contain (OH),F or Cl.
Potassic-magnesio-hastingsite is defined with:
A position: K dominant
C position: Mg dominant divalent ion
W position: (OH) dominant
History
Activities related to discovery and approval of the group members
Structural context
Potassic-magnesio-hastingsite
Crystal System monoclinicCrystal Class prismaticSpace Group C2/m
a9.929—9.958 (9.9435)
b18.037—18.093 (18.065)
c5.326—5.346 (5.336)
alpha90
beta105.326—105.498 (105.412)
gamma90
volume922.978—925.461 (924.2195)
Based on 2 measurements
Chemical context
Stoichiometric formulas
Potassic-magnesio-hastingsite
mindat.org
March 13, 2023KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
IMA
March 13, 2023KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
mineralogy.rocks
Aug. 30, 2022KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
Elements recorded on EPMA
2
Al
2
Ba
2
Ca
2
Fe
2
H
2
I
2
K
2
Mg
2
Mn
2
Na
2
O
2
Si
2
Ti
2
V
1
Cl
Physical properties
ColorColor entities, recognized using a custom trained NER model