Lamprophyllite
Na₂(Sr,Ba)₂Ti₃(SiO₄)₄(OH,F)₂

     Lamprophyllite is a rare species from MSH, and is not distinguishable from its analog barytolamprophyllite.

PHYSICAL CHARACTERISTICS:

Color is usually pale yellow, orange, orange-yellow and brownish
   yellow.
Luster is vitreous to waxy or dull.
Diaphaneity is transparent to opaque.
Crystal System is monoclinic; C2/m.
Crystal Habits include fine fibrous and foliated thin strips to 2mm
   forming compact spheres, and as sharp bladed crystals to 4mm.
Cleavage {100} is perfect, micaceous.
Fracture is uneven.
Hardness is 2 - 3.
Specific Gravity is approximately 3.4 g/cm³.
Streak is pale brown to yellowish.
Associated Minerals include aegirine, albite, eudialyte, fluorite,
   nepheline, pectolite, sodalite and villiaumite.
Distinguishing Features: Crystal habit and luster.
Origin: Named in 1894 from the Greek lampros, shining, plus
   phyllon, leaf, alluding to its high luster and excellent cleavage.

CLASSIFICATION:

REFERENCES:
MinRec 21:316 (1990), Dana 8:1175 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

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