
1) Mineral 2) Phosphate mineral
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https://www.crosswordclues.com/clue/monazite

1) Rare earth
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https://www.crosswordclues.com/clue/monazite

Monazite is a reddish-brown phosphate mineral containing rare earth metals. It occurs usually in small isolated crystals. There are at least four different kinds of monazite, depending on relative elemental composition of the mineral: The elements in parentheses are listed in the order in which they are in relative proportion within the mineral: l...
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http://en.wikipedia.org/wiki/Monazite

• (n.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals.
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http://thinkexist.com/dictionary/meaning/monazite/

phosphate mineral, cerium and lanthanum phosphate [(Ce, La)PO4], that is the major commercial source of cerium. Occurring as small, brown, resinous, ... [4 related articles]
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http://www.britannica.com/eb/a-z/m/111

Monazite. Credit: E. Offermann. Coll. A. Kandblauer, SVSMF A phosphate mineral of widespread occurrence (mined in India, Brazil, the United States, and South Africa) that is the richest source of rare earth elements, such as lanthanum and other members of the lanthanide series. It also contain...
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http://www.daviddarling.info/encyclopedia/M/monazite.html
Mon'a·zite (mŏn'ȧ*zīt)
noun [ From Greek
mona`zein to be solitary, in allusion to its isolated crystals.]
(Min.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals.
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http://www.encyclo.co.uk/webster/M/91

Monazite has the formulae (Ca,La,Nd,Th)PO4 and a relative hardness of 6. It is the chief ore of thorium and cerium. Thorium is a radioactive element. It is concentrated in sand due to its durability and high specific gravity. Associated with other heavy minerals such as magnetite, rutile, and zircon.
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http://www.probertencyclopaedia.com/browse/HM.HTM

[
n] - a reddish-brown mineral containing rare earth metals
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http://www.webdictionary.co.uk/definition.php?query=monazite
noun a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
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https://www.encyclo.co.uk/local/20974

Mineral, (Ce,La,Th)PO
4, yellow to red, valued as a source of lanthanides or rare earths, including cerium and europium; generally found in placer deposit (alluvial) sands
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https://www.encyclo.co.uk/local/21221
(Cerium Lanthanum Thorium Neodymium Yttrium Phosphate) Monazite is actually three different minerals technically, but because of a lack of great differences between them they are referred to as one mineral, monazite. The three monazites have differences in the percentages of their chemical makeup and these differences are re...
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https://www.encyclo.co.uk/local/23719

a reddish- or yellowish-brown mineral, a phosphate of cerium and lanthanum, (Ce,La)PO: the principal ore of thorium.
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https://www.infoplease.com/dictionary/monazite
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