earth science

Sabelliite

Sabelliite 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 Sabelliite rather than just read about it. In short: Sabelliite is a mineral that was first discovered at the Is Murvonis Mine in Dosmusnovas, Sardinia. It was discovered growing in an old fluorite mine.

Key takeaways

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

Reference excerpt

Sabelliite is a mineral that was first discovered at the Is Murvonis Mine in Dosmusnovas, Sardinia. It was discovered growing in an old fluorite mine. It grows as an inter-grown aggregate or as an isolated crystal in a compact quartzitic matrix. It appears as a platy disc-shaped emerald green transparent crystal. The mineral was named after Dr. Cesare Sabelli, researcher at the Consiglio Nazionale delle Ricerche. Sabelliite's ideal chemical formula is (Cu,Zn)2Zn[(As,Sb)O4](OH)3

Occurrence Sabelliite occurs in quartzitic outcrops as small disc shaped crystals. Formed on foliated aggregates of theisite, which it is most similar to in both physical and chemical properties. Both sabelliite and theisite are believed to be weathering products of sulphides and sulphosalts.

Physical properties Sabelliite is a transparent emerald green crystal that grows in platy discs. The crystals appear tabular and cylindrical. The diameter of the crystals rarely exceeds 400 μm, but usually consist of crystals with a diameter of 200μm and a height of 15 μm. Sabelliite streaks light green and has a Mohs hardness of about 4.5. The crystals are brittle with no cleavage. Sabelliite has a calculated density of 4.65 g/cm³.

Optical properties Sabelliite is a transparent mineral with an adamantine luster, or clear transparent look to it. It appears to not be fluorescent under long- or short- waved ultraviolet radiation. Sabelliite is optically nonpleochroic, uniaxial negative. Nonpleochroic means that the mineral does not appear as a different color when rotated under a microscope, while uniaxial negative means it has a single optic axis, meaning that under a microscope when rotated the light will get refracted and experience extinction.

Chemical structure No other elements were found to be associated with sabelliite besides the ones listed in the chemical composition. The empirical formula that was derived from calculations is Cu2.19Zn0.96(As0.80Sb0.16Si0.05)Σ1.01O4.31(OH)2.69. The crystal structure refinement shows that the Zn atoms are both octahedrally and tetrahedrally coordinated.

Chemical composition

X-ray crystallography X-ray crystallography shows that Sabelliite is a trigonal crystal, and that the crystal structure is P3. The data was obtained using a Gandolfi camera with a Ni-filtered CuKα radiation. The dimensions that were calculated using the X-ray diffraction are, a = 8.201(1), b = a, c = 7.315(1) Å. Volume is 426.07(9) Å³. However, the structure determination may have some "inconsistencies."

Worked examples

Example 1 — a first encounter with Sabelliite

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

In research: Sabelliite 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 Sabelliite 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: Sabelliite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antimonate minerals, Arsenate minerals, Trigonal minerals, so understanding it makes those chapters shorter.
In everyday life: Look for Sabelliite 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 Sabelliite in 20 minutes

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

Frequently asked questions

What is Sabelliite in simple terms?

Sabelliite is a mineral that was first discovered at the Is Murvonis Mine in Dosmusnovas, Sardinia. It was discovered growing in an old fluorite mine.

Why does Sabelliite 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 Sabelliite?

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 Sabelliite.