earth science

Libyan desert glass

Libyan desert glass 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 Libyan desert glass rather than just read about it. In short: Libyan desert glass or Great Sand Sea glass is an impactite, made mostly of lechatelierite, found in areas in the eastern Sahara, in the deserts of eastern Libya and western Egypt. Fragments of desert glass can be found over areas of tens of square kilometers.

Key takeaways

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

Reference excerpt

Libyan desert glass or Great Sand Sea glass is an impactite, made mostly of lechatelierite, found in areas in the eastern Sahara, in the deserts of eastern Libya and western Egypt. Fragments of desert glass can be found over areas of tens of square kilometers. Like obsidian, it was knapped and used to make tools during the Pleistocene.

Geologic origin

The origin of desert glass is uncertain. Meteoritic origins have long been considered possible, and recent research links the glass to impact features, such as zircon breakdown, vaporized quartz and meteoritic metals, and to an impact crater. Some geologists, based on a widely reported 2006 study by Sandia National Laboratories, associate the glass with radiative melting from meteoric large aerial bursts, making it analogous to trinitite created from sand exposed to the thermal radiation of a nuclear explosion. Libyan Desert glass has been dated as having formed about 29 million years ago. Analysis of samples with the electron backscatter diffraction (EBSD) technique revealed zircon crystal structures that form only when reidite melts at very high temperatures and is then converted to zircon. Reidite has been found only at meteorite impact sites, where it was formed at the very high pressures of impact. Airbursts never yield this type of mineral transformation.

See also Atacama desert glass – Impact glass found in the Atacama DesertPages displaying short descriptions of redirect targets Darwin glass – Natural tektite glass found in Tasmania Edeowie glass – Natural glass found in South Australia Hypatia (stone) – Candidate for the first comet nucleus Kebira Crater – Circular feature in the Sahara Tektite – Gravel-sized glass beads formed from meteorite impacts Tunguska event – 1908 air burst explosion in Siberia, Russia

References

Literature V. de Michele (ed.): Proceedings of the Silica '96 Meeting on Libyan Desert Glass and related desert events, Bologna, 1997 Contents P.A. Clayton / L.J. Spencer: Silica Glass from the Libyan Desert, Vortrag vom 09.11.1933 online

External links

Google Scholar: "Desert Glass" Glass in Nature from The Corning Museum of Glass

Illustrations

Worked examples

Example 1 — a first encounter with Libyan desert glass

Start with the simplest possible case. Write down what Libyan desert glass 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 Libyan desert glass 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 Libyan desert glass 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 Libyan desert glass

In research: Libyan desert glass 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 Libyan desert glass 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: Libyan desert glass is common in secondary-school and first-year university syllabi. It links to neighbouring topics Geology of Libya, Glass in nature, Impact event minerals, so understanding it makes those chapters shorter.
In everyday life: Look for Libyan desert glass 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 Libyan desert glass in 20 minutes

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

Frequently asked questions

What is Libyan desert glass in simple terms?

Why does Libyan desert glass 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 Libyan desert glass?

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 Libyan desert glass.