Abstract
This chapter gives an overview of the major and minor ore minerals of the rare earths, and of the related major ore deposits. As most of the rare earths are mined in China, the impression may arise that ore deposits of these metals occur in few other places on Earth. However, nothing is less true. The extensive overview of the ore deposits of the rare earths in this chapter is especially meant to indicate that deposits occur in quite a variety of countries, and that the apparent dominance of China is economically (and politically) powered.
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Notes
- 1.
Bastnaesite is also spelled bastnäsite, or bastnasite. In this book, the more common spelling bastnaesite will be used.
- 2.
Carbonatite is a rare igneous carbonate rock (almost invariably intrusive), consisting of more than 50 % carbonate minerals. Worldwide, only one example of extrusive rocks is known: the rocks and lavas of the (active) Ol Doinyo Lengai volcano, Tanzania.
- 3.
The Molybdenum Corporation of America changed its name to Molycorp in 1974. The corporation was acquired by Union Oil in 1977, which in turn became part of Chevron Corporation in 2005. (Molycorp 2014; www.molycorp.com). In 2008, Chevron sold the Mountain Pass mine to the privately held Molycorp Minerals LLC.
- 4.
Dolomite rock is defined as a carbonate rock, containing calcite <50 %, dolomite >50 %. (Visser 1980). The term dolostone has been coined to avoid confusion with the mineral dolomite, CaMg(CO3)2, but has not gained general acceptance.
- 5.
- 6.
Plumbogummite is PbAl3(PO4)2(OH)5·H2O.
- 7.
Aenigmatite is \( {\text{Na}}_{ 2} {\text{Fe}}^{ 2+ }_{ 5} {\text{TiSi}}_{ 6} {\text{O}}_{ 20} \).
- 8.
Astrophyllite is K2Na(Fe, Mn)7Ti2Si8O26(OH)4.
- 9.
Tinguaite is the dike equivalent of phonolite.
- 10.
TREO = Total Rare Earth Oxide, HREO = Heavy Rare Earth Oxide.
- 11.
Khibina is also spelled as Khibiny, or Khibini.
- 12.
The name Lujavrite is derived from the Saami-word Lujávri, meaning (Lake) Lovozero.
- 13.
Goyazite is: SrAl3(PO4)2(OH)5
Florencite is: (Ce, La)Al3(PO4)2(OH)6
- 14.
Pelagic red clay: red colored fine-grained sediment that accumulates as the result of the settling of particles to the floor of the open ocean, far from land. The color results from coatings of iron oxide and manganese oxide on the sediment particles (Source Wikipedia (2015a) Pelagic Red Clay). The word “pelagic” comes from the Greek, and means “open sea”.
- 15.
Ridge faults are central faults from mid-oceanic ridges, which are huge submarine mountain chains.
- 16.
Transform faults are also known as conservative plate boundaries, as they neither create nor destroy lithosphere. These faults have a relative motion which is predominantly horizontal. They tend to be approximately at right angles to mid-oceanic ridges.
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Voncken, J.H.L. (2016). The Ore Minerals and Major Ore Deposits of the Rare Earths. In: The Rare Earth Elements. SpringerBriefs in Earth Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-26809-5_2
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