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Lemoynite crystals - click for larger pic
Lemoynite crystals
L. Horváth sp.
Photo by Violet Anderson
© Royal Ontario Museum

Lemoynite crystals - click for larger pic
Lemoynite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Lemoynite crystals - click for larger pic
Lemoynite crystals
Photo by Violet Anderson
© Royal Ontario Museum

Lemoynite crystals - click for larger pic
Lemoynite crystals
© Doug Merson

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Home > Mineral Descriptions > Lemoynite - (6 Photos)



Lemoynite
(Na,K)2CaZr2Si10O26 · 5-6H2O

     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; C2/c.
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/cm3.
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
¤¤¤

PE
--

AP
¤¤

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

Legend

Lemoynite crystals - click for larger pic
Lemoynite crystals
© Doug Merson

Lemoynite crystals - click for larger pic
Lemoynite crystals
© Stephan Wolfsried