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Barytolamprophyllite
Ba2Na3(Fe3+, Ti4+)3(Si2O7)2(O,OH,F)4

     Barytolamprophyllite is the barium analog to lamprophyllite. It is a rare mineral at MSH.

PHYSICAL CHARACTERISTICS:

Color varies from pale yellow, orange, orange-yellow to
    brownish yellow.
Luster is vitreous to waxy or dull.
Diaphaneity is translucent to opaque.
Crystal System is monoclinic; C2/m.
Crystal Habits include fine fibrous, foliated thin strips to 2mm
   in length forming compact spheres, as sharp randomly oriented
   bladed crystals to 4mm and embedded blades and prisms to
   1.2cm in length.
Cleavage {100} is perfect.
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 1965 for its composition reflecting its barium
   content and similarity to lamprophyllite.

CLASSIFICATION:

Dana System
# 56.2.6c.1

Strunz Classification
# VIII/C.13-40

REFERENCES:
MinRec 21:298 (1990), Dana 8:1174 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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