Milarite
K2Ca4Al2Be4Si24O60 · H2O

     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; P6/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/cm3.
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
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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