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Dolomite
CaMg(CO3)2

     Dolomite is common at MSH. Its hexagonal crystals display some interesting color zoning, with alternating colorless and yellow or light and dark brown zones.

PHYSICAL CHARACTERISTICS:

Color ranges from white to pale pink to beige brown, pale to
   apple-green and colorless.
Luster is vitreous to pearly.
Diaphaneity is translucent to opaque.
Crystal System is hexagonal; R3.
Crystal Habits include sharp curved rhombohedra or as zoned
   short hexagonal prisms and plates to 12mm.
Cleavage {1011} is perfect.
Fracture is conchoidal.
Hardness is 3.5-4
Specific Gravity is approximately 2.85 g/cm3.
Streak is colorless to white, grayish and greenish.
Associated Minerals include albite, anatase, calcite, chlorite group,
   fluorapatite, fluorite, galena, gmelinite, marcasite, molybdenite,
   pyrite, quartz, rutile, siderite and sphalerite.
Distinguishing Features: Crystal habit.
Origin: Named in 1791 after Déodat Guy Silvain Tancrède Gratet
    de Dolomieu (1750-1801), French engineer and mineralogist.

CLASSIFICATION:

Dana System
# 14.2.1.1

Strunz Classification
# V/B.3-10

REFERENCES:
MinRec 21:305 (1990), Dana 8:450-451 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
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PE
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AP
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MX
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SS
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MC
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HF
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BR
--

SX
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FR
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