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Diopside crystals - click for larger pic
Diopside crystals
Photo by Doug Merson
© Doug Merson

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Diopside
CaMgSi2O6

     Diopside, a member of the pyroxene group, is quite rare at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually pale green; pale pink on the tabular crystals.
Luster is vitreous.
Diaphaneity is transparent to opaque.
Crystal System is monoclinic; C2/c.
Crystal Habits include masses of small prisms and tabular
   crystals to 5mm.
Cleavage {110} is distinct and {010} is imperfect.
Fracture is uneven to conchoidal.
Hardness is 5.5 - 6.5
Specific Gravity is approximately 3.3 g/cm3.
Streak is white to greyish-white.
Associated Minerals include arfvedsonite, calcite and pectolite.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1800 from the Greek dis, double, plus opsis, view,
   because two views can be taken of its prismatic form.

CLASSIFICATION:

Dana System
# 65.1.3a.1

Strunz Classification
# VIII/F.1-50

REFERENCES:
MinRec 21:305 (1990), Dana 8:1296-1298 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
¤¤

BR
--

SX
--

FR
--

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