CaAlBeSi2460 · H
Milarite, a member of the osumilite group, is exceedingly rare at MSH.
It fluoresces blue-white under SW. It bears very close ressemblance to pectolite and is easily overlooked.
PHYSICAL CHARACTERISTICS:
Color is usually white to colorless.
Luster is vitreous to silky to dull.
Diaphaneity is translucent to opaque.
Crystal System is hexagonal; 6/mcc
Crystal Habits include aggregates of crude hexagonal prisms
to 3mm on pectolite.
Cleavage none.
Fracture is conchoidal to uneven.
Hardness is 5.5 – 6.
Specific Gravity is approximately 2.55 g/cm
Streak is white.
Associated Minerals include aegirine, apophyllite group, calcite,
fluorite, pectolite and poudretteite.
Distinguishing Features: Crystal habit and its triated nature.
Origin: Named in 1870 after its occurrence at Val Millar, Switzerland.
CLASSIFICATION:
Dana System
# 63.2.1a.12
Strunz Classification
# VIII/E.22-20
REFERENCES:
MinRec 21:322 (1990), Dana 8:1277-1278 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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