Röntgenite-(Ce)
Ca₂Ce₃(CO₃)₅F₃

     Röntgenite-(Ce) is another moderately rare species from MSH.

PHYSICAL CHARACTERISTICS:

Color is usually brown.
Luster is waxy.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal; R3.
Crystal Habits include platy balls.
Cleavage is not apparent.
Fracture is (??).
Hardness is ~ 4.5
Specific Gravity is approximately 4.2 g/cm³.
Streak is (??).
Associated Minerals include albite, dolomite and elpidite.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1953 after Wilhelm Konrad Rontgen (1845-1923),
   German physicist who discovered X-Rays.

CLASSIFICATION:

REFERENCES:
Dana 8:481 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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