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Zeophyllite crystals - click for larger pic
Zeophyllite crystals - 4mm
© Gilles Haineault

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Zeophyllite
Ca13Si10O28(OH)2F8 · 6H2O

     Zeophyllite is a rare accessory mineral at MSH.

PHYSICAL CHARACTERISTICS:

Color is usually white.
Luster is vitreous to silky.
Diaphaneity is translucent to opaque.
Crystal System is triclinic; (??).
Crystal Habits include small thin and radiating foliated plates forming
   1mm spherical aggregates.
Cleavage {001} is perfect.
Fracture is (??).
Hardness is 3.
Specific Gravity is approximately 2.8 g/cm3.
Streak is white.
Associated Minerals include apophyllite series, calcite, fluorite,
   molybdenite, pectolite, polylithionite, pyrite and vesuvianite.
Distinguishing Features: None from other white fibrous species.
Origin: Named in 1902 from the Greek zeon, to boil, plus phyllon,
   a leaf, alluding to its occurrence in hemispheric foliated forms and
   intumescence on heating.

CLASSIFICATION:

Dana System
# 73.1.4.1

Strunz Classification
# VIII/H.34-50

REFERENCES:
MinRec 21:347 (1990), Dana 8:1547-1548 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

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