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| Chemistry:
Na3Y(CO3)3·3(H2O)
[Hydrated
Sodium Yttrium Carbonate] | Discovered
in 1990;
IMA
status: Valid (IMA Approved 1992). Shomiokite
is named for the Shomiok River, in the Lovozero massif,
flowing near Mt. Alluaiv, Kola Peninsula, Russia where
the mineral was first found. |
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Classification
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Mineral
Classification: |
Carbonates |
Strunz 8th
Ed. ID:
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5/D.03-05
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Nickel-Strunz 10th
Ed. ID:
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5.CC.20 |
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5 : CARBONATES (NITRATES) C : Carbonates without additional
anions, with H2O C : With rare earth elements (REE)
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Related
to: |
Calkinsite-(Ce) - Lokkaite-(Y) Series
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Crystal
Data
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Crystallography:
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Orthorhombic
- Pyramidal
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Crystal
Habit:
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Short
prismatic pseudohexagonal crystals, to 2 mm, in rosettelike
aggregates; massive granular, to 30 cm.
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Twinning:
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None
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Physical
Properties
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Cleavage: |
[110]
Perfect; Parting on [001]
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Fracture: |
Irregular/Uneven
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Tenacity:
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Brittle
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Hardness
(Mohs): |
2.0
- 3.0
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Density:
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2.52 (g/cm3)
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Luminescence:
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None |
Radioactivity:
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Not
Radioactive
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Other: |
S
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Optical
Properties
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Color: |
Colorless,
Pink, pale Yellow
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Transparency: |
Translucent,
Transparent in small pieces |
Luster: |
Earthy
(Dull), Waxy to Silky |
Refractive
Index: |
1.528
- 1.531
Biaxial ( + )
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Birefringence: |
0.0030
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Dispersion: |
None to Weak;
r > v |
Pleochroism: |
None |
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Occurances
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Geological
Setting: |
In
interstices and as large segregations in potassic feldspar
in pegmatites (Mt. Alluaiv, Kola Peninsula, Russia);
associated with an intrusive alkalic gabbro-syenite
complex (Mont Saint-Hilaire, Canada). |
Common
Associations: |
Aegirine,
Albite, Cancrinite, Elpidite, Kogarkoite, Natron, Natroxalate,
Neighborite, Villiaumite, Siderite, Sidorenkite, Sphalerite
Trona (Mt. Alluaiv, Kola Peninsula, Russia); Aegirine,
Albite, Analcime, Catapleiite, Eudialyte, Microcline,
Petersenite-(Ce), Sphalerite, Rhodochrosite (Mont
Saint-Hilaire, Canada) |
Type
Locality: |
Shomiokitovoe pegmatite body, Umbozero Mine, Alluaiv
Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region,
Russia |
Year
Discovered: |
1990
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View
mineral photos: |
Shomiokite
Mineral Photos and Locations |
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More
Information
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Mindat.org Webmineral.com |
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Shomiokite is
an extremely rare mineral and gem that was only discovered
in 1990 and approved by the IMA
in 1992. Its chemistry is a Hydrated
Sodium Yttrium Carbonate which is colorless to pink
or pale yellow. Shomiokite crystals are rare and minute
(short prismatic pseudohexagonal crystals to 2 mm) and
more commonly found as rosettelike aggregates or massive
granular forms to 30cm.
There
are only two locations for finding Shomiokite: Mt.
Alluaiv, Lovozero massif, Kola Peninsula, Russia; and Mont
Saint-Hilaire, Quebec, Canada.
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Shomiokite
gems for sale:
We
have not photographed our Shomiokite gems. Please
check back soon.
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