Thomasclarkite

Thomasclarkite

Infobox mineral
name = Thomasclarkite-(Y)
category = Mineral
boxwidth =
boxbgcolor =


caption =
formula = (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O)
molweight = 375.77 gm
color = White, Yellow
habit = Blocky crystals pseudo-tetragonal
system = Monoclinic - Sphenoidal
twinning = Common on (101)
cleavage = [010] Perfect, [101] Parting
fracture = Brittle - Uneven - Very brittle fracture producing uneven fragments
mohs = 2-3
luster = Vitreous (Glassy)
refractive = α= 1.40, β= 1.540, γ= 1.540
opticalprop = pseudouniaxial negative 2V(meas.) = 5°
birefringence = δ = 0.140
pleochroism =
streak = white
gravity = 2.30
melt =
fusibility =
diagnostic =
solubility =
diaphaneity = Translucent to transparent
other = Radioactivity 770 Bq/g

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

ee also

*List of minerals
*List of minerals named after people

References

* [http://webmineral.com/data/Thomasclarkite-(Y).shtml Webmineral]
* [http://www.saint-hilaire.ca/en/thomas.htm Mont Saint-Hilaire]
* [http://www.mindat.org/min-7336.html Mindat with location data]
* [http://rruff.geo.arizona.edu/doclib/hom/thomasclarkitey.pdf Mineral Data Publishing]


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