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Thomasclarkite-(Y)

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Thomasclarkite-(Y)
General
CategoryCarbonate mineral
Formula
(repeating unit)
(Na, Ce)(Y, REE)(HCO3)(OH)3·4(H2O)
IMA symbolTcl-Y[1]
Crystal systemMonoclinic
Crystal classSphenoidal (2)
(same H-M symbol)
Space groupP2
Identification
Formula mass375.77 g/mol
ColorWhite, yellow
Crystal habitBlocky crystals, pseudo-tetragonal
TwinningCommon on (101)
Cleavage[010] Perfect, [101] parting
FractureUneven
TenacityVery brittle
Mohs scale hardness2–3
LusterVitreous (glassy)
StreakWhite
DiaphaneityTranslucent to transparent
Specific gravity2.30
Optical propertiesPseudouniaxial negative 2V (meas.) ≤ 5°
Refractive indexnα = 1.40, nβ = 1.540, nγ = 1.540
Birefringenceδ = 0.140
Other characteristics Radioactive 770 Bq/g
References[2][3][4]

Thomasclarkite-(Y) is a rare mineral which was known as UK-93 until 1997, when it was renamed in honour of Thomas H. Clark (1893–1996), McGill University professor. The mineral is one of many rare-earth element minerals from Mont Saint-Hilaire. The only reported occurrence is in an alkalic pegmatite dike in an intrusive gabbro-nepheline syenite.

See also

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References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ http://rruff.geo.arizona.edu/doclib/hom/thomasclarkitey.pdf Handbook of Mineralogy
  3. ^ http://webmineral.com/data/Thomasclarkite-(Y).shtml Webmineral data
  4. ^ http://www.mindat.org/min-7336.html Mindat