Ankerite
Ca(Fe²⁺,Mg,Mn²)(CO₃)₂

     A member of the dolomite group with dolomite and kutnohorite, ankerite is a relatively rare mineral species at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually pale beige or white.
Luster is vitreous to pearly.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal; R3.
Crystal Habits include epitactic growths to 1mm.
Cleavage: {101} is perfect.
Fracture is uneven to subconchoidal.
Hardness is 3.5 - 4.
Specific Gravity is approximately 2.75 g/cm³.
Streak is white.
Associated Minerals include albite, chlorite group, elpidite,
   marcasite and sphalerite.
Distinguishing Features: Indistinguishable from other members
   of dolomite or calcite groups.
Origin: Named in 1825 after Professor Mathias Joseph Anker
   (1771-1843), Austrian mineralogist.

CLASSIFICATION:

REFERENCES:
MinRec 21:296 (1990), Dana 8:451 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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