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Riebeckite crystals - click for larger pic
Riebeckite crystals
Photo by Stephan Wolfsried
© Stephan Wolfsried

Riebeckite crystals - click for larger pic
Riebeckite crystals
Photo by Modris Baum
© Modris Baum

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Home > Mineral Descriptions > Riebeckite - (2 Photos)



Riebeckite
Na2Fe32+Fe23+(Si8O22(OH)2

     Riebeckite, a member of the amphibole group, is fairly rare at Mont Saint-Hilaire.

PHYSICAL CHARACTERISTICS:

Color is usually grayish blue or grayish green.
Luster is vitreous to silky.
Diaphaneity is translucent.
Crystal System is monoclinic; C2/m.
Crystal Habits include matted or radiating flexible fibers to 5cm.
Cleavage {110} is perfect.
Fracture is uneven to subconchoidal.
Hardness is 5 - 6.
Specific Gravity is approximately 3.2 g/cm3.
Streak is gray.
Associated Minerals include albite, apophyllite series, calcite,
   eudialyte and pectolite.
Distinguishing Features: Crystal habit.
Origin: Named in 1888 after Emil Riebeck (1853-1885), German
   explorer who collected the mineral.

CLASSIFICATION:

Dana System
# 66.1.3c.5

Strunz Classification
# VIII/F.08-50

REFERENCES:
MinRec 21:333 (1990), Dana 8:1361-1364 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
--

MC
--

HF
¤¤

BR
--

SX
--

FR
--

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