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Monazite was the only significant source of commercial lanthanides, but because of concern over the disposal of the radioactive daughter products of thorium, bastnäsite came to displace monazite in the production of lanthanides in the 1960s due to its much lower thorium content.
Monazite can form in fabrics caused by deformation. Monazite may be present as elongate grains aligned in foliation. It can be interpreted that either the monazite formed before the shearing and was aligned during shearing, or formed at the same time as the shearing. [3] It thus provides an upper limit of the shearing age.
It is the cerium-dominant analogue of monazite-(La), monazite-(Nd), and monazite-(Sm). It is also the phosphorus analogue of gasparite-(Ce). [ 3 ] The group contains simple rare earth phosphate minerals with the general formula of AXO 4 , where A = Ce, La, Nd, or Sm (or, rarely, Bi), and X = P or, rarely, As.
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Monazite-(Ce) is the most common representative of the monazites, with "-Ce" being the Levinson suffix informing on the dominance of the particular REE element representative. [ 47 ] [ 48 ] [ 49 ] Also the cerium-dominant bastnäsite-(Ce) is the most important of the bastnäsites.
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Huttonite is isostructural with monazite. Substitution of the rare-earth elements and phosphorus of monazite with thorium and silicon of huttonite can occur to generates a solid solution . At the huttonite end-member, continuous rare-earth substitution of thorium of up to 20% by weight has been observed.
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