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Lemoynite crystals
L. Horváth sp.
Photo by Violet Anderson
© Royal Ontario Museum
Lemoynite crystals
Photo by Violet Anderson
© Royal Ontario Museum
Lemoynite crystals
Photo by Violet Anderson
© Royal Ontario Museum
Lemoynite crystals
© Doug Merson
(Na,K)CaZrSi1026 · 5-6H
Lemoynite (formerly UK #13) was described in 1969 from Mont Saint-
Hilaire. The occurrence is very rare and seems to be confined to a heavily altered pegmatite.
PHYSICAL CHARACTERISTICS:
Color is usually white to tan, pale yellowish white, colorless,
pale brown, pale gray and pale greenish gray.
Luster is vitreous to dull.
Diaphaneity is transparent to translucent to opaque.
Crystal System is monoclinic; 2/
Crystal Habits include compact spheres and spherical aggregates
to 8mm of individual prisms or blades radiating from a common
center; the elongated prisms or bladed crystals are terminated by
steep basal pinacoids.
Cleavage {010} and {100} are perfect, {001} is poor.
Fracture is uneven.
Hardness is approximately 4.
Specific Gravity is approximately 2.29 g/cm
Streak is white.
Associated Minerals include albite, calcite, dolomite, microcline,
pyrite and siderite.
Distinguishing Features: Crystal habit and cleavage.
Origin: Named in 1969 for Charles Lemoyne, Baron de Longueuil,
(1625-1685), a prominent figure in the early history of Canada.
CLASSIFICATION:
Dana System
# 74.3.3.2
Strunz Classification
# VIII/G.09-10
REFERENCES:
CanMin 9:585-596 (1969), CanMin 14:132-138 (1976),
MinRec 21:318 (1990), Dana 8:1563(1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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Lemoynite crystals
© Doug Merson
Lemoynite crystals
© Stephan Wolfsried