Thomasclarkite-(Y)

Last updated
Thomasclarkite-(Y)
Thomasclarkite-(Y)-107522.jpg
General
Category Carbonate mineral
Formula
(repeating unit)
(Na, Ce)(Y, REE)(HCO3)(OH)3·4(H2O)
Crystal system Monoclinic
Crystal class Sphenoidal (2)
(same H-M symbol)
Space group P2
Identification
Formula mass 375.77 g/mol
Color White, yellow
Crystal habit Blocky crystals, pseudo-tetragonal
Twinning Common on (101)
Cleavage [010] perfect, [101] parting
Fracture Uneven
Tenacity Very brittle
Mohs scale hardness 2–3
Luster Vitreous (Glassy)
Streak white
Diaphaneity Translucent to transparent
Specific gravity 2.30
Optical properties pseudouniaxial negative 2V (meas.) ≤ 5°
Refractive index nα = 1.40, nβ = 1.540, nγ = 1.540
Birefringence δ = 0.140
Other characteristics Radioactivity 770 Bq/g
References [1] [2] [3]

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.

Thomas Henry Clark, Ph.D., FRSC was a Canadian geologist who is considered to have been one of the nation's top scientists of the 20th century. He was a professor who authored over 100 scientific publications. After his death, a mineral was named in his honour.

McGill University English-language university in Montreal, Quebec

McGill University is a public research university in Montreal, Quebec, Canada. It was established in 1821 by royal charter, granted by King George IV. The university bears the name of James McGill, a Montreal merchant originally from Scotland whose bequest in 1813 formed the university's precursor, McGill College.

Mineral Element or chemical compound that is normally crystalline and that has been formed as a result of geological processes

A mineral is, broadly speaking, a solid chemical compound that occurs naturally in pure form. A rock may consist of a single mineral, or may be an aggregate of two or more different minerals, spacially segregated into distinct phases. Compounds that occur only in living beings are usually excluded, but some minerals are often biogenic and/or are organic compounds in the sense of chemistry. Moreover, living beings often syntesize inorganic minerals that also occur in rocks.

See also

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References