earth science

Hemusite

Hemusite 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 Hemusite rather than just read about it. In short: Hemusite (IMA symbol: Hm) is a very rare isometric gray mineral containing copper, molybdenum, sulfur, and tin with chemical formula Cu6SnMoS8. Discovery and occurrence It was discovered by Bulgarian mineralogist Georgi Ivanov Terziev in 1963.

Key takeaways

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

Reference excerpt

Hemusite (IMA symbol: Hm) is a very rare isometric gray mineral containing copper, molybdenum, sulfur, and tin with chemical formula Cu6SnMoS8.

Discovery and occurrence It was discovered by Bulgarian mineralogist Georgi Ivanov Terziev in 1963. He also described it and named it after Haemus, the ancient name of Stara planina (Balkan) mountains in Europe. The type locality is Chelopech copper ore deposit, Bulgaria. Later tiny deposits of hemusite were found in Ozernovskoe deposit, Kamchatka, Russia; Kawazu mine, Rendaiji, Shimoda city, Chūbu region, Honshu Island, Japan; Iriki mine, Iriki, Satsuma-gun, Kagoshima Prefecture, Kyushu Region, Japan; Kochbulak deposit, Tashkent, Uzbekistan. Hemusite occurs as rounded isometric grains and aggregates usually about 0.05 mm in diameter and in association with enargite, luzonite, colusite, stannoidite, renierite, tennantite, chalcopyrite, pyrite, and other minerals.

See also List of minerals recognized by the International Mineralogical Association

References

Further reading Shimizu, Masaaki; Kato, Akira; Matsubara, Satoshi (1988). "Hemusite and paraguanajuatite from the Kawazu mine, Shizuoka Prefecture, Japan". Mineralogical Journal. 14 (3): 92. Bibcode:1988MinJ...14...92S. doi:10.2465/minerj.14.92. Gaines, Richard V.; Skinner, H. Catherine W.; Foord, Eugene E.; Mason, Brian; Rosenzweig, Abraham; King, Vendall (1997). Dana's New Mineralogy: The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana. New York, Chichester, Weinheim, Brisbane, Singapore, Toronto: John Wiley & Sons, Inc. p. 93.

Illustrations

Worked examples

Example 1 — a first encounter with Hemusite

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

In research: Hemusite 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 Hemusite 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: Hemusite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Copper minerals, Cubic minerals, Minerals in space group 207, so understanding it makes those chapters shorter.
In everyday life: Look for Hemusite 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 Hemusite in 20 minutes

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

Frequently asked questions

What is Hemusite in simple terms?

Hemusite (IMA symbol: Hm) is a very rare isometric gray mineral containing copper, molybdenum, sulfur, and tin with chemical formula Cu6SnMoS8. Discovery and occurrence It was discovered by Bulgarian mineralogist Georgi Ivanov Terziev in 1963.

Why does Hemusite 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 Hemusite?

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 Hemusite.