earth science

Scandiobabingtonite

Scandiobabingtonite 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 Scandiobabingtonite rather than just read about it. In short: Scandiobabingtonite was first discovered in the Montecatini granite quarry near Baveno, Italy in a pegmatite cavity. Though found in pegmatites, the crystals of scandiobabingtonite are sub-millimeter sized, and are tabular shaped.

Key takeaways

Scandiobabingtonite 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 Scandiobabingtonite to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Scandiobabingtonite from memory before moving on to harder problems.

Reference excerpt

Scandiobabingtonite was first discovered in the Montecatini granite quarry near Baveno, Italy in a pegmatite cavity. Though found in pegmatites, the crystals of scandiobabingtonite are sub-millimeter sized, and are tabular shaped. Scandiobabingtonite was the sixth naturally occurring mineral discovered with the rare earth element scandium, and grows around babingtonite, with which it is isostructural, hence the namesake. It is also referred to as scandian babingtonite. The ideal chemical formula for scandiobabingtonite is Ca2(Fe2+,Mn)ScSi5O14(OH).

Occurrence Scandiobabingtonite is found in association with orthoclase, quartz, light blue albite, stilbite, fluorite, and mica. When found with these minerals, the scandiobabingtonite crystals are emplanted on the surface of the other minerals. It also occurs as growth around green-black prismatic crystals of babingtonite. The samples of scandiobabingtonite that have been discovered have shown that they start out growing from a seed of babingtonite crystal. This is how scandiobabingtonite gets its chemical structure. The starting seed of babingtonite is still present in the center of the resulting crystal and can be detected with optical and chemical studies. Scandiobabingtonite is a uniquely rare mineral, as it occurs in very small amounts in few locations around the world. It is one of thirteen naturally occurring minerals where scandium is a dominant member. The other scandium minerals are bazzite, cascandite, hetftetjernite, jervisite, juonniite, kolbeckite, kristiansenite, magbasite, oftedalite, pretulite, thortveitite, and titanowodginite. Scandium can also concentrate in other minerals, such as in ferromagnesian minerals, aluminum phosphate minerals, meteoric minerals, and other minerals containing rare earth elements, but it occurs in trace amounts.

Physical properties Scandiobabingtonite is a colorless or lightly gray-green colored transparent mineral with a glassy or vitreous luster. It exhibits a hardness of 6 on the Mohs hardness scale. Scandiobabingtonite occurs as short, prismatic crystals that are slightly elongated on the [001] axis which gives it a tabular or platy shape. Its crystals are characterized by the {010}, {001}, {110}, {1-10}, and {101} faces. Scandiobabingtonite is brittle and shows perfect cleavage along the {001} and {1-10} planes. The measured density is 3.24 g/cm3.

Optical properties Scandiobabingtonite is biaxial positive, which means it will refract light along two axes. It exhibits a 2V(measured)=64(2)°, strong dispersion with r>v, and displays strong pleochroism with colors ranging from pink (γ') to green(α'). The extinction angle along the (110) is 6°. Z:Φ=-250°, ρ=47°; Y:Φ=146°, ρ=75°; X:Φ=42°, ρ=47°.

Chemical properties Scandiobabingtonite is isostructural with babingtonite, and has the same chemical properties as well. It is an inosilicate with 5-periodic single chains. Scandium replaces the Fe3+ in babingtonite in six-fold coordination. The empirical chemical formula for scandiobabingtonite is (Ca1.71,Na0.25)Σ0.97(Fe2+0.65,Mn0.32)Σ0.97(Sc0.91,Sn0.04,Fe3+0.03)Σ0.98Si5.09O14.00(OH)1.00. Simplified, the formula is Ca2(Fe2+,Mn)ScSi5O14(OH)

Chemical composition

X-ray crystallography Scandiobabingtonite is in the triclinic crystal system, with space group P1. The unit cell dimensions are a=7.536(2) Å, b=11.734(2) Å, c=6.748(2) Å, α=91.70(2)°, β=93.86(2)°, γ=104.53(2)°. These dimensions are almost identical to those of babingtonite. The difference in dimensions is caused by the replacement of iron with scandium in the Fe3+-centered octahedra. The Fe3+-O distance measures as 2.048 Å, while the Sc-O distance is 2.092 Å. This equates to a slightly larger octahedra in scandiobabingtonite than babingtonite.

Worked examples

Example 1 — a first encounter with Scandiobabingtonite

Start with the simplest possible case. Write down what Scandiobabingtonite 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 Scandiobabingtonite 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 Scandiobabingtonite 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 Scandiobabingtonite

In research: Scandiobabingtonite 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 Scandiobabingtonite 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: Scandiobabingtonite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Minerals in space group 2, Minerals of Baveno, Natural materials, so understanding it makes those chapters shorter.
In everyday life: Look for Scandiobabingtonite 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 Scandiobabingtonite in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Scandiobabingtonite 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 Scandiobabingtonite out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Scandiobabingtonite in simple terms?

Why does Scandiobabingtonite 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 Scandiobabingtonite?

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 Scandiobabingtonite.