earth science

Vigezzite

Vigezzite 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 Vigezzite rather than just read about it. In short: Vigezzite is a variant of the mineral aeschynite containing calcium, cerium, niobium, tantalum, and titanium. It was first discovered near Orcesco, Valle Vigezzo, Provo Novara, Northern Italy, in cavities of an albitic rock.

Key takeaways

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

Reference excerpt

Vigezzite is a variant of the mineral aeschynite containing calcium, cerium, niobium, tantalum, and titanium. It was first discovered near Orcesco, Valle Vigezzo, Provo Novara, Northern Italy, in cavities of an albitic rock. The crystals of Vigezzite are flat prismatic crystals up to 2-3 mm length of an orange-yellow color.The name Vigezzite was chosen to draw attention to the locality that has produced the first occurrence of a Ca-Nb-Ta-mineral with Nb dominance over Ta, crystallizing with the aeschynite structure. The ideal chemical formula for vigezzite is (Ca,Ce),(Nb,Ta,Ti)2O6

Occurrence Vigezzite is found in association with albitic rock in miarolitic cavities. Albitic rock is rock which contains the mineral albite and is closely associated with feldspars. When found with these minerals, the vigezzite crystals are implanted on the surface of the other minerals and rock. It occurs in pegmatite dikes that contain potassium feldspar converted to sodic feldspar by an albitization process. This dike formation is a direct relation to the metamorphism that occurs in the area and is the reason for the formation of vigezzite.

Physical properties Vigezzite is an orange-yellow colored transparent mineral forming thin brittle crystals with a sub metallic luster. It exhibits a hardness of 4.5-5 on the Mohs hardness scale. Vigezzite forms long prismatic crystals up to 2-3 mm in length, elongated along their a-axis and flattened on (010). The crystals are strongly striated on (010) parallel to prism axis. The prisms are terminated by the pinacoids (100) only. The measured density is 5.54. g/cm3.

Optical properties Vigezzite is biaxial positive, which means it will refract light differently along two axes. It exhibits an extreme dispersion, and displays no pleochroism.

Chemical properties The empirical chemical formula for vigezzite is (Ca0.82,Ce0.24)Σ1.06(Nb0.9,Ta0.62,Ti0.5)Σ2.02O6,.

Chemical composition

X-ray crystallography Vigezzite is in the orthorhombic crystal system, with space group Pnmb. The unit cell dimensions are a=7.55 Å, b=11.03 Å, c=5.36 Å, α=90.00°, β=90.00°, γ=90.00°. Because the mineral occurs in small but well-shaped single crystals, X-ray photographs are of excellent quality. For vigezzite, the morphological prism axis parallels the crystallographic a-axis.

Illustrations

Worked examples

Example 1 — a first encounter with Vigezzite

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

In research: Vigezzite 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 Vigezzite 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: Vigezzite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cerium minerals, Minerals described in 1979, Niobium minerals, so understanding it makes those chapters shorter.
In everyday life: Look for Vigezzite 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 Vigezzite in 20 minutes

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

Frequently asked questions

What is Vigezzite in simple terms?

Why does Vigezzite 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 Vigezzite?

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 Vigezzite.