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Thorogummite
(Th,U,Ce)(SiO4)1-x(OH)4x

     Thorogummite is very rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color ranges from pale brown to greenish brown and red-brown.
Luster is resinous.
Diaphaneity is translucent to opaque.
Crystal System is tetragonal; I41/amd.
Crystal Habits include radiating acicular crystals to 3mm and
   embedded grains.
Cleavage {100} is distinct, not always apparent.
Fracture is conchoidal to splintery.
Hardness is 4.5
Specific Gravity is approximately 3 - 5 g/cm3 (depending on
   water content).
Streak is brownish.
Associated Minerals include aegirine, analcime, astrophyllite,
   catapleiite, eudialyte, gonnardite, microcline, rhodochrosite,
   sérandite and sodalite.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1889 for its thorium content and the Latin gummi,
   gum, alluding to its gum-like appearance.

CLASSIFICATION:

Dana System
# 51.5.2.5

Strunz Classification
# VIII/A.09-50

REFERENCES:
MinRec 21:343 (1990), Dana 8:1058-1059 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
¤¤

BR
--

SX
¤¤

FR
--

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