earth science

Gabrielite

Gabrielite 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 Gabrielite rather than just read about it. In short: Gabrielite is an extremely rare thallium sulfosalt mineral with a chemical formula of Tl6Ag3Cu6(As,Sb)9S21 or Tl2AgCu2As3S7. It was first reported in 2002 for its occurrence in the Lengenbach quarry, Binntal, Valais, Switzerland.

Key takeaways

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

Reference excerpt

Gabrielite is an extremely rare thallium sulfosalt mineral with a chemical formula of Tl6Ag3Cu6(As,Sb)9S21 or Tl2AgCu2As3S7. It was first reported in 2002 for its occurrence in the Lengenbach quarry, Binntal, Valais, Switzerland. According to Faszination Lengenbach (2008), only 2 specimens are known. A few dozen tiny fragments like the one pictured are circulating few collections. Named after Walter Gabriel (born 1943), a Swiss mineral photographer. This region was transformed during the greenschist-garnet/amphibolite facies of metamorphism. Due to this many rare sulfosalts like gabrielite are found in this part of Switzerland.

Structure and properties Gabrielite has a pseudohexagonal shape and the crystal structure is composed of parallel sheets of ditriagonalization of hexagons which reduces it to a P3 symmetry. According to the American Mineralogist, Gabrielite shows a 6-Fold outline. Gabrielite is part of the triclinic crystal system, which means that the pseudohexagonal shape that this mineral occurs in nature with only has a center of symmetry. Looking into the optical mineralogy of this mineral we have to define if the mineral is isotropic (uniformity properties in all directions on the axes), or anisotropic (when measured the differences in the properties along the axes). According to Mindat.org, Gabrielite has anisotropic properties. Which means that the velocity of light changes in crystallographic direction, this is easily identifiable in thin section. Another optical property is birefringence (the difference between the two refractive indices, epsilon and omega ray). Gabrielite has very weak anisotropism which is the reason why gabrielite shows little to no birefringence. Mindat.org stated that the mineral gabrielite is not pleochroic (different wavelengths are absorbed in different directions, the color of the mineral varies when rotating the stage in plane polarized light). Gabrielite is a sulfosalt mineral species occurring as idiomorphic crystals commonly found in cavities of Triassic dolomite. The physical properties of sulfosalts such as gabrielite, the mineral can be used for thermoelectric conducting, and magnetism.

References

Illustrations

Worked examples

Example 1 — a first encounter with Gabrielite

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

In research: Gabrielite 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 Gabrielite 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: Gabrielite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antimony minerals, Arsenic minerals, Copper(I) minerals, so understanding it makes those chapters shorter.
In everyday life: Look for Gabrielite 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 Gabrielite in 20 minutes

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

Frequently asked questions

What is Gabrielite in simple terms?

Why does Gabrielite 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 Gabrielite?

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 Gabrielite.