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Paraumbite crystals - click for larger pic
Paraumbite crystals - 0,3mm
© Gilles Haineault

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Paraumbite
K3Zr2HSi6O18 · nH2O

     Paraumbite is an extremely rare mineral species at MSH.

PHYSICAL CHARACTERISTICS:

Color ranges from colorless to very pale yellow and white to tan.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; (??).
Crystal Habits include hexagonal plates, stacked rosettes and
   equant crystals.
Cleavage {010} is micaceous and {100} is less perfect.
Fracture is (??).
Hardness is ~4.5
Specific Gravity is approximately 2.6 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, analcime, calcite,
   eudialyte, microcline, natrolite, pyrite, rutile, sérandite, siderite,
   sodalite and ussingite.
Distinguishing Features: Crystal habit.
Origin: Named in 1983 from the Greek para, near, and umbite,
   to which it is similar.

CLASSIFICATION:

Dana System
# 59.2.1.2

Strunz Classification
# VIII/F.20-20

REFERENCES:
MinRec 21:327 (1990), Dana 8:1225 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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