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Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© Doug Merson

Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© Modris Baum

Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© Modris Baum

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Home > Mineral Descriptions > Shomiokite-(Y) - (6 Photos)



Shomiokite-(Y)
Na3(Y,Dy)(CO3)3 · 3H2O

     Shomiokite-(Y) is extremely rare at MSH. It was originally described in 1982 in Russia, although the irregular grains proved to be unsuitable for
X-ray diffraction. The crystal structure of shomiokite-(Y) was possible with the Mont Saint-Hilaire material.

PHYSICAL CHARACTERISTICS:

Color is usually pale-yellow or colorless.
Luster is silky.
Diaphaneity is transparent to translucent.
Crystal System is orthorhombic; P.
Crystal Habits include striated short prismatic crystals and crystalline
   masses.
Cleavage {110} is perfect.
Fracture is (??).
Hardness is 2 - 3.
Specific Gravity is approximately 2.5 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, analcime, catapleiite,
   eudialyte, microcline, petersenite, rhodochrosite, sphalerite and UK #91.
Distinguishing Features: Crystal habit.
Origin: Named in 1992 after its discovery locality near the Shomiok River,
   Kola Peninsula, Russia.

CLASSIFICATION:

Dana System
# 15.4.7.1

Strunz Classification
# V/D.03-05

REFERENCES:
CanMin 34:649-655 (1996), Dana 8:474 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
--

MX
--

SS
--

MC
--

HF
--

BR
--

SX
--

FR
--

Legend

Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© Modris Baum

Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© Stephan Wolfsried

Shomiokite-(Y) crystals - click for larger pic
Shomiokite-(Y) crystals
© David Joyce