Richterite
Na(CaNa)(Mg,Fe²⁺₅(Si₈O₂₂)(OH)₂

     Richterite, a member of the amphibole group is rare at the locality.

PHYSICAL CHARACTERISTICS:

Color is usually colorless or pale green.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; C2/m.
Crystal Habits include prismatic crystals to 3mm.
Cleavage {110} is perfect.
Fracture is uneven.
Hardness is 5 - 6.
Specific Gravity is approximately 3.2 g/cm³.
Streak is white.
Associated Minerals include aegirine, albite, amphibole group,
   analcime, ancylite, arfvedsonite, calcite, diopside, fluorite, gonnardite,
   microcline, pectolite, quartz, sodalite and tainiolite.
Distinguishing Features: Crystal habit.
Origin: Named in 1865 for Theodor Richter (1824-1898), German
   mineralogist and metallurgist.

CLASSIFICATION:

REFERENCES:
MinRec 21:333 (1990), Dana 8:1358 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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