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Celestine crystals - click for larger pic
Celestine crystals
Photo by Doug Merson
© Doug Merson

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Celestine
Na26REE6(SiO3)6(PO4)6(CO3)6(S4+O2)O

     Celestine is extremely rare at Mont Saint-Hilaire and is hard to distinguish visually.

PHYSICAL CHARACTERISTICS:

Color varies from white to tan.
Luster is dull.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; Pbnm.
Crystal Habits include compact spherical aggregates to 1mm.
Cleavage {001} is perfect, {210} is good and {010} is indistinct.
Fracture is uneven.
Hardness is 3 - 3.5
Specific Gravity is approximately 3.95 g/cm3.
Streak is white.
Associated Minerals include gypsum and pyrite.
Distinguishing Features: Crystal habit.
Origin: Named in 1791 from the Latin caelestis, of the sky, alluding
   to its blue-sky color commonly exhibited by its crystals.

CLASSIFICATION:

Dana System
# 28.3.1.2

Strunz Classification
# VI/A.9-10

REFERENCES:
MinRec 21:302 (1990), Dana 8:574-575 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
¤¤

BR
--

SX
--

FR
--

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