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Searlesite crystals - click for larger pic
Searlesite crystals - 1,2mm
Photo by Gilles Haineault
© Gilles Haineault

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

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Home > Mineral Descriptions > Searlesite - (2 Photos)



Searlesite
NaBSi2O5(OH)2

     Searlesite is extremely rare at MSH. Specimens fluoresce green with a bluish tint under SW.

PHYSICAL CHARACTERISTICS:

Color is usually colorless.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is monoclinic, P21.
Crystal Habits include sharp tabular prismatic crystals to 3mm.
Cleavage {100} is micaceous, {010} and {001} are average.
Fracture is not apparent due to cleavage.
Hardness is 1 - 2.
Specific Gravity is approximately 2.45 g/cm3.
Streak is white.
Associated Minerals include aegirine, eudialyte, natrolite, sodalite
   and steenstrupine.
Distinguishing Features: Crystal habits.
Origin: Named in 1914 after John W. Searles, American pionneer
   and discoverer of Searles Lake.

CLASSIFICATION:

Dana System
# 74.3.5.4

Strunz Classification
# VIII/G.05-10

REFERENCES:
MinRec 21:334 (1990), Dana 8:1566 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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