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Petarasite crystal
Photo by Violet Anderson
László Horváth specimen
© Royal Ontario Museum

Petarasite crystals - click for larger pic
Petarasite crystals
© Stephan Wolfsried

Petarasite crystals - click for larger pic
Petarasite crystals
© Quintin Wight

Petarasite crystals - click for larger pic
Petarasite crystals
© Modris Baum

Petarasite crystals - click for larger pic
Petarasite crystals
© Modris Baum

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Home > Mineral Descriptions > Petarasite (TL) - (11 Photos)



Petarasite (Type Locality)
Na5Zr2Si6O18(Cl,OH) · 2H2O

     Petarasite, a member of the lovozerite group, was described at Mont Saint-Hilaire in 1980. It is relatively uncommon at MSH, there were some excellent crystals found in the Fall of 1997.

PHYSICAL CHARACTERISTICS:

Color is varies from light to dark greenish-yellow, yellowish-brown,
   orange to orange-yellow, brown and rasberry red.
Luster is vitreous to greasy.
Diaphaneity is transparent, translucent to opaque.
Crystal System is monoclinic; C2/m.
Crystal Habits include superb prismatic crystals to 5cm; equant,
   blocky, tabular crystals and irregular grains to 10mm; rasberry red
   crystals are micro (less than 1mm).
Cleavage {110} is perfect, {010} is very good and {001} is distinct.
Fracture is subconchoidal.
Hardness is 5 - 5.5
Specific Gravity is approximately 2.88 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, analcime, ancylite,
   arfvedsonite, astrophyllite, calcite, cancrinite, catapleiite, eudialyte,
   fluorite, galena, låvenite, microcline, natrolite, nepheline, pyrochlore,
   pyrrhotite, rhodochrosite, rinkite (mosandrite) and sodalite.
Distinguishing Features: Crystal habit.
Origin: Named in 1980 after Peter Tarassoff (b. 1934), Canadian
   metallurgical engineer.

CLASSIFICATION:

Dana System
# 61.1.2b.3

Strunz Classification
# VIII/E.16-70

REFERENCES:
CanMin 18:497-502 (1980), CanMin 18:503-509 (1980),
CanMin 19:411-413 (1981), MinRec 21:329-330 (1990),
Dana 8:1249 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
¤¤

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

Legend

Petarasite crystals - click for larger pic
Petarasite crystals
© Elmar Lackner

Petarasite crystals - click for larger pic
Petarasite crystals
© Doug Merson

Petarasite crystals - click for larger pic
Petarasite crystals
© Jason B. Smith

Petarasite crystals - click for larger pic
Petarasite crystals
© Doug Merson

Petarasite crystals - click for larger pic
Petarasite crystals
© Stephan Wolfsried

Petarasite crystals - click for larger pic
Petarasite crystals
© Doug Merson