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Wöhlerite crystals - click for larger pic
Wöhlerite crystals
Canadian
Museum of Nature sp.
Photo by Violet Anderson
© Royal Ontario Museum

Wöhlerite crystals - click for larger pic
Wöhlerite crystal
© Doug Merson

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Home > Mineral Descriptions > Wöhlerite - (2 Photos)



Wöhlerite
NaCa2(Zr,Nb)Si2O7(O,OH,F)2

     Wöhlerite is a very rare mineral at Mont Saint-Hilaire. It is one of the earliest minerals to form in the paragenetic sequence.

PHYSICAL CHARACTERISTICS:

Color is usually pale yellow to orange-yellow.
Luster is vitreous to greasy.
Diaphaneity is transparent to translucent and opaque.
Crystal System is monoclinic; P21.
Crystal Habits include thin tabular crystals to 5mm forming
   aggregates of crystals.
Cleavage {010} is distinct, {100} and {110} are indistinct.
Fracture is conchoidal to splintery.
Hardness is 5.5 - 6.
Specific Gravity is approximately 3.4 g/cm3.
Streak is yellowish-white.
Associated Minerals include aegirine, amphibole group, analcime,
   ancylite, astrophyllite, biotite, eudialyte, fluorite, marcasite, microcline,
   natrolite, paranatrolite, pyrrhotite, titanite and zircon.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1843 after Fredrich Wöhler (1800-1882),
   German professor of chemistry.

CLASSIFICATION:

Dana System
# 56.2.4.5

Strunz Classification
# VIII/C.11-10

REFERENCES:
MinRec 21:346-347 (1990), Dana 8:1163-1164 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
¤¤

HF
--

BR
--

SX
--

FR
--

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