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Weloganite
Na2Sr3Zr(CO3)6 · 3H2O

     Weloganite is extremely rare at Mont Saint-Hilaire. It has only been found on a few specimens. The discovery locality is the Francon quarry in Montreal 35 kilometers to the West of MSH.

PHYSICAL CHARACTERISTICS:

Color is usually yellow.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is triclinic; P1.
Crystal Habits include anhedral glassy fragments to 2mm in donnayite
   crystals.
Cleavage {001} is perfect.
Fracture is conchoidal.
Hardness is 3.5
Specific Gravity is approximately 3.2 g/cm3.
Streak is white.
Associated Minerals include albite, analcime, donnayite, pyrite, siderite,
   strontianite and zircon.
Distinguishing Features: Crystal habit.
Origin: Named in 1968 after Sir William Edmond Logan (1798-1875),
   first director of Geological Survey of Canada.

CLASSIFICATION:

Dana System
# 15.3.4.4

Strunz Classification
# V/D.04-30

REFERENCES:
MinRec 21:346 (1990), Dana 8:470-471 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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