Fresnoite

The Ba analogue of alfredcasparite. Fresnoite is ferroelectric.

History

Activities related to discovery and approval of the group members

Structural context

Fresnoite
Crystal System tetragonalCrystal Class ditetragonal pyramidalSpace Group P4bm
a8.5146—8.52 (8.5177)
b8.5146—8.52 (8.5177)
c5.2041—5.211 (5.209)
alpha90
beta90
gamma90
volume377.289—378.2 (377.9178)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Fresnoite
mindat.org
  • March 13, 2023Ba2Ti(Si2O7)O
IMA
  • March 13, 2023Ba2TiO(Si2O7)
mineralogy.rocks
  • Aug. 30, 2022Ba2Ti4+O(Si2O7)

Elements recorded on EPMA

4
Ba
4
O
4
Si
4
Ti

Physical properties

ColorColor entities, recognized using a custom trained NER model
  • lemon
  • canary yellow
Color noteOriginal color note from the source
Lemon to canary yellow
StreakStreak entities, recognized using a custom trained NER model
    Streak noteOriginal streak note from the source
    White
    Lustre
    Vitreous
    Hardness
    3—4