Calcioancylite-(Ce)
CaCe(CO₃)₂(OH) · H₂O

     Calcio-ancylite-(Ce) is less rare than previously thought at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually colorless or pink.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; Pmmm.
Crystal Habits include bladed crystals to 0.5mm and individual
   prismatic crystals.
Cleavage is not apparent.
Fracture is conchoidal.
Hardness is 4.
Specific Gravity is approximately 4.1 g/cm³.
Streak is white.
Associated Minerals include aegirine, albite, amphibole group, analcime,
   ancylite-(Ce), astrophyllite, bastnäsite, biotite, calcite, catapleiite,
   epididymite, fluorapatite, fluorite, galena, genthelvite, leucophanite,
   mangan-neptunite, microcline, natrolite, nenadkevichite, phlogopite,
   polylithionite, pyrochlore, rhodochrosite, sérandite, sphalerite
   and wurtzite.
Distinguishing Features: Crystal habits.
Origin: Named in 1922 to reflect its calcium content and its analogy
   to ancylite.

CLASSIFICATION:

REFERENCES:
MinRec 21:295-296 (1990), Dana 8:498 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

Legend

Calcioancylite-(Ce) crystal
© Gilles Haineault