Gehlenite

Gehlenite-Åkermanite Series. Chemically very similar to bicchulite and kamaishilite (both hydrous, however).

History

Activities related to discovery and approval of the group members

Structural context

Gehlenite
Crystal System tetragonalCrystal Class tetragonal scalenohedralSpace Group P-421m
a7.679—7.79 (7.7107)
b7.679—7.79 (7.7107)
c5.03—5.1 (5.0561)
alpha90
beta90
gamma90
volume298.7—305.241 (300.5978)

Based on 29 measurements

Chemical context

Stoichiometric formulas

Gehlenite
mindat.org
  • Nov. 16, 2024Ca2Al[AlSiO7]
  • March 13, 2023Ca2Al(AlSiO7)
IMA
  • March 13, 2023Ca2Al(SiAl)O7
mineralogy.rocks
  • Aug. 30, 2022Ca2Al(AlSiO7)

Elements recorded on EPMA

26
Al
26
Ca
26
O
26
Si
22
Mg
21
Fe
20
Na
16
Mn
10
K
8
Ti

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • yellow-brown
  • colourless
  • greenish grey
Color noteOriginal color note from the source
Yellow-brown, colourless, greenish grey
StreakStreak entities, recognized using a custom trained NER model
  • grey-white
Streak noteOriginal streak note from the source
White, grey-white
Lustre
Vitreous
Greasy
Hardness
5—6