earth science

Volynskite

Volynskite 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 Volynskite rather than just read about it. In short: Volynskite (Russian: Волынски́т), is a rare hydrothermal mineral of the sulfide class (the matildite group), that forms microscopic grains in related minerals, which in composition is a complex bismuth-silver telluride with the calculated formula AgBiTe2. Volynskite was first discovered and identified between 1960 and 1965 by Marianna Bezsmertnaya and Lada Soboleva who observed thin sections among closely related te…

Key takeaways

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

Reference excerpt

Volynskite (Russian: Волынски́т), is a rare hydrothermal mineral of the sulfide class (the matildite group), that forms microscopic grains in related minerals, which in composition is a complex bismuth-silver telluride with the calculated formula AgBiTe2. Volynskite was first discovered and identified between 1960 and 1965 by Marianna Bezsmertnaya and Lada Soboleva who observed thin sections among closely related tellurides in the territory of the Zod gold deposit. It was named in honor of the late professor of mineralogy and head of the mineralogy department at the Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Igor Volynsky, who had died suddenly in September 1962.

Discovery history and name For the first time, a new previously unknown mineral (the future volynskite) was encountered by M. S. Bezsmertnaya and Sh. O. Amirayan during a microscopic study of samples from the Sotk gold mine and was initially mistaken for wehrlite. In the course of further research conducted in 1960–1963, it was established that, based on a combination of chemical, X-ray, and optical characteristics, this mineral differs from all natural tellurium compounds described in the literature and represents a new, independent mineral species. After three years of hard work, Marianna Bezsmertnaya recalled the first steps in identifying the new mineral: “During a microscopic study of ores from gold deposits in Armenia, M.S. Bezsmertnaya and Sh.O. Amiryan encountered a mineral in the telluride association that differed little in optical properties from tellurobismuthite, with which it was closely intergrown in the form of microscopically small inclusions. Based on optical features and qualitative chemical composition, the mineral was initially mistaken for wehrlite (pilsenite). However, the results of our subsequent detailed studies of the chemical composition, crystallographic and optical properties showed that the mineral encountered was previously unknown and had not been described by anyone.” In 1960, when the composition of the mineral had not yet been precisely determined, studies were conducted using the local microspectral analysis method using N. V. Korolev's setup. The future volynskite was removed on one plate with tellurobismuthite, which was closely intergrown with it, and the analysis conditions for both minerals were identical. The closeness of the elemental composition of volynskite to tellurobismuthite made it possible to at least approximately estimate the content of individual elements in it.[9] Based on the results of microsample analysis, it was established that the main elements included in the composition of volynskite are silver, bismuth, and tellurium. In the same 1960, similar studies were conducted by Z. M. Sverdlov on a microspectral setup at A.P. Karpinsky Russian Geological Research Institute (VSEGEI). The same elements were identified in the composition of the new mineral. A year later, at the personal request of Marianna Bezsmertnaya, a more detailed quantitative microspectral analysis of the future volynskite was conducted by N. V. Korolev at the State Optical Institute in Leningrad. Two closely related tellurides were used as standards for calculating the mineral formula: tellurobismuthite (Bi2Te3) and hessite (Ag2Te). Before filing an application for registration of the new mineral, a total of 11 microspectral and 7 X-ray analyses were conducted. Based on the results of the study, the formula of volynskite was finally established as AgBiTe2, close within the error limits to the synthetic compound AgBiTe2. In 1962, also at the request of researchers, an artificial compound of the composition AgBiTe2 was synthesized by A. Yu. Malevsky in the experimental laboratory of IMGRE from stoichiometric quantities of its three constituent elements. The synthesis was carried out for five hours at temperatures of 1000-1400 °C, followed by quenching for one and a half hours from 400° in an open furnace with free access to air. According to the chemical composition, optical and X-ray data, a fundamental similarity was noted between the low-temperature modification of AgBiTe2 obtained at the Institute of Semiconductors, the main phase of the compound synthesized by A. Yu. Malevsky and the mineral under study. Specific difficulties in studying the new mineral were primarily related to the lack of any massive samples that would allow determination using qualitative analysis. As a result, the authors of the future discovery repeatedly checked and rechecked the results obtained using different methods.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Volynskite

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

In research: Volynskite 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 Volynskite 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: Volynskite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bismuth minerals, Minerals described in 1964, Silver minerals, so understanding it makes those chapters shorter.
In everyday life: Look for Volynskite 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 Volynskite in 20 minutes

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

Frequently asked questions

What is Volynskite in simple terms?

Why does Volynskite 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 Volynskite?

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 Volynskite.