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Terskite crystals - click for larger pic
Terskite crystals - 5mm
© Stephan Wolfsried

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Terskite
Na4ZrSi6O15(OH)2 · H2O

     Terskite was found in 1984 at MSH and is a rare mineral species at the locality. It displays weak yellowish-white fluorescence under SW and LW.

PHYSICAL CHARACTERISTICS:

Color is usually white.
Luster is vitreous, porcelaneous to dull.
Diaphaneity is translucent to opaque.
Crystal System is orthorhombic; Pnc2.
Crystal Habits include dodecahedral crystals to 2.5mm replacing
   lovozerite crystals.
Cleavage none observed.
Fracture is (??).
Hardness is 5.
Specific Gravity is approximately 2.7 g/cm3.
Streak is white.
Associated Minerals include albite, cancrinite, eudialyte, epistolite,
   gmelinite, gonnardite, natrolite, polylithionite, ussingite and UK #38.
Distinguishing Features: Crystal habit and mineral associations.
Origin: Named in 1983 after its discovery locality, near the Terski
   coast of the White Sea.

CLASSIFICATION:

Dana System
# 78.7.15.1

Strunz Classification
# VIII/F.23-20

REFERENCES:
MinRec 21:342 (1990), Dana 8:1718-1719 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
¤¤

FR
--

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