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Calcioancylite-(Ce)

• 
  Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
  © JBS 2006

• Formula:
  (Ca,Sr)Ce(CO₃)₂(OH) · H₂O

• System: Orthorhombic

• Name:
  From the Greek αγκυλός ("ankylos") for "curved", in allusion to its usually rounded and distorted crystal shapes, and the prefix "CALCIO-" in allusion to its composition with CALCIum dominant over strontium, plus the "-(Ce)" suffix due to cerium being the dominant REE.

• IMA Status: Valid (Approved)

• Dana 8th: 16b.1.1.2
  
  16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
  1 : A_mB_n(XO₃)_pZ_qxH₂O & with (m+n):p = 1:1

• Hardness (Mohs): 4 - 4½

• Lustre: Vitreous,Greasy

• Diapheny: Translucent

• Diapheny: brittle