earth science

Lanthanite

Lanthanite is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lanthanite rather than just read about it. In short: Lanthanites are a group of isostructural rare earth element (REE) carbonate minerals. This group comprises the minerals lanthanite-(La), lanthanite-(Ce), and lanthanite-(Nd).

Key takeaways

Lanthanite belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lanthanite to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lanthanite from memory before moving on to harder problems.

Reference excerpt

Lanthanites are a group of isostructural rare earth element (REE) carbonate minerals. This group comprises the minerals lanthanite-(La), lanthanite-(Ce), and lanthanite-(Nd). This mineral group has the general chemical formula of (REE)2(CO3)3·8(H2O). Lanthanites include La, Ce, and Nd as major elements and often contain subordinate amounts of other REEs including praseodymium (Pr), samarium (Sm), europium (Eu) and dysprosium (Dy). The lanthanite crystal structure consists of layers of tenfold-coordinated REE-oxygen (O) polyhedra and carbonate (CO2−3) groups connected by hydrogen bonds to interlayer water molecules, forming a highly hydrated structure.

Origin and formation Lanthanites are frequently found as secondary minerals formed by the weathering of other minerals and occur as scales or tabular crystals. Originally identified at Bastnäs, Sweden, they have subsequently been found in New Zealand, Japan, Madagascar, Wales, China, France, Germany, Greenland, Finland, Canada, Austria, Romania, Norway, Brazil, and the United States. Recently, a different mechanism of formation of lanthanites was discovered: Lanthanites also can form via a highly hydrated, nanoparticulate and poorly ordered carbonate precursor. The lifetime of this rare-earth bearing precursor as well as the kinetics of crystallization of the various REE-lanthanites are dependent on the specific trivalent rare-earth ion involved in the reaction. The times needed for lanthanites to fully crystallize increase linearly with the ionic potential of the trivalent rare-earth ion (La3+, Ce3+, Pr3+, Nd3+) present in their structure. The differences in these ion sizes and ionic potential as well as differences in dehydration energy of the trivalent rare-earth ions control the lifetime of the poorly ordered precursor and thus also the crystallization kinetics of the lanthanites. Furthermore, they also affect the structural characteristics (e.g. unit-cell dimensions and standard shape) of the crystals.

References

Other sources Webmineral data Mindat with location data RRUFF Project

Further reading Miyawaki R, Matsubara S, Yokoyama K, Iwano S, Hamasaki K, Yukinori I (2003) Kozoite-(La), La(CO3)(OH), a new mineral from Mitsukoshi, Hizen-cho, Saga Prefecture, Japan. Journal of Mineralogical and Petrological Sciences 98, 137–141. Miyawaki, R., Matsubara, S., Yokoyama, K., Takeuchi, K., Terada, Y., & Nakai, I. (2000). Kozoite-(Nd), Nd(CO3)(OH), a new mineral in an alkali olivine basalt from Hizen-cho, Saga Prefecture, Japan. American Mineralogist, 85(7–8), 1076–1081. Sheard, E.R., Williams-Jones, A.E., Heiligmann, M., Pederson, C., Trueman, D.L. (2012) Controls on the concentration of zirconium, niobium, and the rare earth elements in the Thor Lake rare metal deposit, Northwest Territories, Canada. Economic Geology, 107(1), 81–104. Nordrum, F. S. (2007): Nyfunn av mineraler i Norge 2006–2007. Stein 34 (2), 14–26. Husdal, T. (2009): Ancylittmineraler i Norge. Norsk Bergverksmuseum Skrift 41, 33–42. Larsen, A. O. (1994): Drusemineraler fra Solumsåsen pukkverk, Holmestrand. Stein 21 (2), 136–141. Minerals of Georgia: Their properties and occurrences. Robert Cook GGWRD Bull 92. American Mineralogist: 38: 1169–1183 New Data on Minerals (2004): 39: 50–64. Jensen (1978) Minerals of New York State.*Dana 6: 767; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837–1892, Volume II: 242.*Rocks & Minerals: 6: 26; Rocks & Minerals: 10: 33–36, 58. Handbook of Mineralogy — Anthony, Bideaux, Bladh, Nichols; Hess, F. L. 1908. Minerals of the rare-earth metals at Baringer Hill, Llano County, Texas. U.S. Geological Survey Bulletin 340. 286–294. Schooner, Richard. (1958): The Mineralogy of the Portland–East Hampton–Middletown–Haddam Area in Connecticut (With a few notes on Glastonbury and Marlborough).

Illustrations

Worked examples

Example 1 — a first encounter with Lanthanite

Start with the simplest possible case. Write down what Lanthanite claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lanthanite before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lanthanite ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lanthanite

In research: Lanthanite appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lanthanite in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lanthanite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carbonate minerals, Lanthanide minerals, Minerals in space group 56, so understanding it makes those chapters shorter.
In everyday life: Look for Lanthanite outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lanthanite in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lanthanite means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lanthanite out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lanthanite in simple terms?

Lanthanites are a group of isostructural rare earth element (REE) carbonate minerals. This group comprises the minerals lanthanite-(La), lanthanite-(Ce), and lanthanite-(Nd).

Why does Lanthanite matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lanthanite?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lanthanite.