Parisite-(Ce)

Crystals pseudohexagonal, oscillatory and sceptered due to intergrowths parallel to the pseudo-{0001) with Bastnäsite-(Ce), Synchysite-(Ce), Röntgenite-(Ce) and Cordylite. Polytypes 2M (very common), 3R and 6R are known or proposed. The Ce-analogue of Parisite-(Nd) and Parisite-(La). Very rare; can be distinguished from Synchysite-(Ce) only by analytical methods. Also chemically similar to röntgenite-(Ce). Compare UM1998-04-CO:CaCeF, UM1998-05-CO:CaCeF, UM1998-06-CO:CaCeF, UM1998-07-CO:CaCeF, UM1998-08-CO:CaCeF, and UM1998-09-CO:CaCeF.

History

Activities related to discovery and approval of the group members

Structural context

Parisite-(Ce)
Crystal System monoclinicCrystal Class domaticSpace Group Cc
a7.1059—12.3049 (9.706)
b7.1056—7.12 (7.1094)
c28.2478—84.1 (56.1237)
alpha90
beta90—98.2416 (94.1129)
gamma90—120 (105)
volume2444.3—3692.21 (3062.6505)

Based on 4 measurements

Chemical context

Stoichiometric formulas

Parisite-(Ce)
mindat.org
  • March 13, 2023CaCe2(CO3)3F2
IMA
  • March 13, 2023CaCe2(CO3)3F2
mineralogy.rocks
  • Aug. 30, 2022CaCe3+2(CO3)3F2

Elements recorded on EPMA

3
C
3
Ca
3
Ce
3
F
3
O
1
La
1
Nd
1
Y

Physical properties

ColorColor entities, recognized using a custom trained NER model
    • brownish-yellow
    • waxy yellow
    • gray-yellow
    • colourless
    Color noteOriginal color note from the source
    Brown, brownish-yellow, waxy yellow, gray-yellow; colourless to yellow in transmitted light.
    Lustre
    Vitreous
    Resinous
    Pearly
    Fracture
    Splintery
    Sub-Conchoidal
    Transparency
    Transparent
    Translucent
    Tenacity
    brittle
    Hardness
    4.5
    Measured density
    4.33—4.39
    Calculated density
    4.38