earth science

Stibnite

Stibnite 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 Stibnite rather than just read about it. In short: Stibnite, sometimes called antimonite, is a sulfide mineral, a mineral form of antimony trisulfide (Sb2S3). It is a soft, metallic grey crystalline solid with an orthorhombic space group.

Key takeaways

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

Reference excerpt

Stibnite, sometimes called antimonite, is a sulfide mineral, a mineral form of antimony trisulfide (Sb2S3). It is a soft, metallic grey crystalline solid with an orthorhombic space group. It is the most important source for the metalloid antimony. The name is derived from the Greek στίβι stibi through the Latin stibium as the former name for the mineral and the element antimony.

Structure Stibnite has a structure similar to that of arsenic trisulfide, As2S3. The Sb(III) centers, which are pyramidal and three-coordinate, are linked via bent two-coordinate sulfide ions. However, some studies suggest that the actual coordination polyhedra of antimony are SbS7, with (3+4) coordination at the M1 site and (5+2) at the M2 site. Some of the secondary bonds impart cohesion and are connected with packing. Stibnite is grey when fresh, but can turn superficially black due to oxidation in air.

Properties The melting point of Sb2S3 is 823 K (550 °C; 1,022 °F). The band gap is 1.88 eV at room temperature and it is a photoconductor. Stibnite is also toxic upon ingestion, with symptoms similar to those of arsenic poisoning.

Uses

Pastes of Sb2S3 powder in fat or in other materials have been used since c. 3000 BC as eye cosmetics in the Mediterranean and farther afield; in this use, Sb2S3 is called kohl. It was used to darken the brows and lashes, or to draw a line around the perimeter of the eye. Antimony trisulfide finds use in pyrotechnic compositions, namely in the glitter and fountain mixtures. Needle-like crystals, "Chinese needles", are used in glitter compositions and white pyrotechnic stars. The "dark pyro" version is used in flash powders to increase their sensitivity and sharpen their report. It is also a component of modern safety matches. It was formerly used in flash compositions, but its use was abandoned due to toxicity and sensitivity to static electricity. Stibnite was used ever since protodynastic ancient Egypt as a medication and a cosmetic. The Sunan Abi Dawood reports, "prophet Muhammad said: 'Among the best types of collyrium is antimony (ithmid) for it clears the vision and makes the hair sprout.'" The 17th century alchemist Eirenaeus Philalethes, also known as George Starkey, describes stibnite in his alchemical commentary An Exposition upon Sir George Ripley's Epistle. Starkey used stibnite as a precursor to philosophical mercury, which was itself a hypothetical precursor to the philosopher's stone.

Occurrence Stibnite occurs in hydrothermal deposits and is associated with realgar, orpiment, cinnabar, galena, pyrite, marcasite, arsenopyrite, cervantite, stibiconite, calcite, ankerite, barite and chalcedony. Small deposits of stibnite are common, but large deposits are rare. The world's largest deposit of antimony, the Xikuangshan mine, yields high quality crystals in paragenesis with calcite. It occurs in Canada, Mexico, Peru, Japan, Germany, Romania, Italy, France, England, Algeria, and Kalimantan, Borneo. In the United States it is found in Arkansas, Idaho, Nevada, California, and Alaska. Historically, the Romans used stibnite mined in Dacia to make colourless glass, the making of which ended when this province was lost to the Roman Empire. As of May 2007, the largest specimen on public display (1000 pounds) is at the American Museum of Natural History. The largest documented single crystals of stibnite measured ~60×5×5 cm and originated from different locations including Japan, France and Germany.

See also List of minerals Stibnides, compounds of antimony

References

External links

Chisholm, Hugh, ed. (1911). "Stibnite" . Encyclopædia Britannica (11th ed.). Cambridge University Press. "Materials Safety Data Sheet: Antimony(III) sulfide". ThermoFisher Scientific. 2010-11-16. Archived from the original on 2025-10-06. Retrieved 2025-10-06.

Illustrations

Worked examples

Example 1 — a first encounter with Stibnite

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

In research: Stibnite 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 Stibnite 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: Stibnite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alchemical substances, Antimony minerals, Glances, so understanding it makes those chapters shorter.
In everyday life: Look for Stibnite 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 Stibnite in 20 minutes

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

Frequently asked questions

What is Stibnite in simple terms?

Stibnite, sometimes called antimonite, is a sulfide mineral, a mineral form of antimony trisulfide (Sb2S3). It is a soft, metallic grey crystalline solid with an orthorhombic space group.

Why does Stibnite 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 Stibnite?

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 Stibnite.