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Thenardite
Na2SO4

     Thenardite is relatively rare at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually white.
Luster is vitreous to resinous.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic, Fddd.
Crystal Habits include powdery masses.
Cleavage {010} is perfect and {101} is fair.
Fracture is uneven to hackly.
Hardness is 2.5 - 3.
Specific Gravity is approximately 2.6 g/cm3.
Streak is white.
Associated Minerals include calcite, kogarkoite, pectolite and shortite.
Distinguishing Features: Crystal habit.
Origin: Named in 1826 after Louis Jacques Thenard (1777-1857), French
   professor of chemistry.

CLASSIFICATION:

Dana System
# 28.2.3.1

Strunz Classification
# VI/A.07-10

REFERENCES:
Dana 8:570 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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