ZME Science
No Result
View All Result
ZME Science
No Result
View All Result
ZME Science

Home → Other → GeoPicture

#GeoPicture of the day: Amethyst

Mihai AndreibyMihai Andrei
June 17, 2016
in GeoPicture
A A
Share on FacebookShare on TwitterSubmit to Reddit

RelatedPosts

Titanium: how we use the metal of the titans
The ancient world of crinoids: Stunning photos of these flower-like fossils that are not flowers
Stunning geological folds at Mount Head in Canada
Volcanoes on other planets — Venus’ Maat Mons, Earth’s Karymsky, Mars’ Olympus Mons, Io, and Enceladus
Evitachoel / Pixabay

For all its beauty, amethyst is a fairly common variety of quartz. This here isn’t even a particularly special image, it’s how amethyst looks like most of the time. What is it about this mineral that makes it so special?

Quartz itself is the second-most-abundant mineral in Earth’s crust. Amethyst is one of the more common of the quartz varieties. Amethyst usually has a color varying from a light violet to a deep purple. The color in amethyst is usually unevenly distributed in the individual crystals. Ironically, the color is given by a technical defect – the presence of traces of built into its crystal lattice. But even when the color is deep, the content of iron in the amethyst is rather low, ranging from 10 to 100 parts per million.

Usually, amethyst crystals don’t get very large, rarely reaching 30 centimeters or more. Previously, amethyst used to be considered one of the most valuable gemstones in the world, but with many discoveries in the world (especially in Brazil), its price has dropped dramatically, up to the point where you can find it at many flea markets.

But regardless of its market value, amethyst remains one of the most cherished gemstones. Its simple beauty just makes me stop and admire it for a moment.

Tags: amethystGeoPicture

ShareTweetShare
Mihai Andrei

Mihai Andrei

Dr. Andrei Mihai is a geophysicist and founder of ZME Science. He has a Ph.D. in geophysics and archaeology and has completed courses from prestigious universities (with programs ranging from climate and astronomy to chemistry and geology). He is passionate about making research more accessible to everyone and communicating news and features to a broad audience.

Related Posts

GeoPicture

Titanium: how we use the metal of the titans

byMihai Andrei
12 months ago
GeoPicture

The ancient world of crinoids: Stunning photos of these flower-like fossils that are not flowers

byMihai Andrei
1 year ago
Geology

Stunning geological folds at Mount Head in Canada

byMihai Andrei
1 year ago
Volcanoes

Volcanoes on other planets — Venus’ Maat Mons, Earth’s Karymsky, Mars’ Olympus Mons, Io, and Enceladus

byMihai Andrei
2 years ago

Recent news

The UK Government Says You Should Delete Emails to Save Water. That’s Dumb — and Hypocritical

August 16, 2025

In Denmark, a Vaccine Is Eliminating a Type of Cervical Cancer

August 16, 2025
This Picture of the Week shows a stunning spiral galaxy known as NGC 4945. This little corner of space, near the constellation of Centaurus and over 12 million light-years away, may seem peaceful at first — but NGC 4945 is locked in a violent struggle. At the very centre of nearly every galaxy is a supermassive black hole. Some, like the one at the centre of our own Milky Way, aren’t particularly hungry. But NGC 4945’s supermassive black hole is ravenous, consuming huge amounts of matter — and the MUSE instrument at ESO’s Very Large Telescope (VLT) has caught it playing with its food. This messy eater, contrary to a black hole’s typical all-consuming reputation, is blowing out powerful winds of material. This cone-shaped wind is shown in red in the inset, overlaid on a wider image captured with the MPG/ESO telescope at La Silla. In fact, this wind is moving so fast that it will end up escaping the galaxy altogether, lost to the void of intergalactic space. This is part of a new study that measured how winds move in several nearby galaxies. The MUSE observations show that these incredibly fast winds demonstrate a strange behaviour: they actually speed up far away from the central black hole, accelerating even more on their journey to the galactic outskirts. This process ejects potential star-forming material from a galaxy, suggesting that black holes control the fates of their host galaxies by dampening the stellar birth rate. It also shows that the more powerful black holes impede their own growth by removing the gas and dust they feed on, driving the whole system closer towards a sort of galactic equilibrium. Now, with these new results, we are one step closer to understanding the acceleration mechanism of the winds responsible for shaping the evolution of galaxies, and the history of the universe. Links  Research paper in Nature Astronomy by Marconcini et al. Close-up view of NGC 4945’s nucleus

Astronomers Find ‘Punctum,’ a Bizarre Space Object That Might be Unlike Anything in the Universe

August 15, 2025
  • About
  • Advertise
  • Editorial Policy
  • Privacy Policy and Terms of Use
  • How we review products
  • Contact

© 2007-2025 ZME Science - Not exactly rocket science. All Rights Reserved.

No Result
View All Result
  • Science News
  • Environment
  • Health
  • Space
  • Future
  • Features
    • Natural Sciences
    • Physics
      • Matter and Energy
      • Quantum Mechanics
      • Thermodynamics
    • Chemistry
      • Periodic Table
      • Applied Chemistry
      • Materials
      • Physical Chemistry
    • Biology
      • Anatomy
      • Biochemistry
      • Ecology
      • Genetics
      • Microbiology
      • Plants and Fungi
    • Geology and Paleontology
      • Planet Earth
      • Earth Dynamics
      • Rocks and Minerals
      • Volcanoes
      • Dinosaurs
      • Fossils
    • Animals
      • Mammals
      • Birds
      • Fish
      • Amphibians
      • Reptiles
      • Invertebrates
      • Pets
      • Conservation
      • Animal facts
    • Climate and Weather
      • Climate change
      • Weather and atmosphere
    • Health
      • Drugs
      • Diseases and Conditions
      • Human Body
      • Mind and Brain
      • Food and Nutrition
      • Wellness
    • History and Humanities
      • Anthropology
      • Archaeology
      • History
      • Economics
      • People
      • Sociology
    • Space & Astronomy
      • The Solar System
      • Sun
      • The Moon
      • Planets
      • Asteroids, meteors & comets
      • Astronomy
      • Astrophysics
      • Cosmology
      • Exoplanets & Alien Life
      • Spaceflight and Exploration
    • Technology
      • Computer Science & IT
      • Engineering
      • Inventions
      • Sustainability
      • Renewable Energy
      • Green Living
    • Culture
    • Resources
  • Videos
  • Reviews
  • About Us
    • About
    • The Team
    • Advertise
    • Contribute
    • Editorial policy
    • Privacy Policy
    • Contact

© 2007-2025 ZME Science - Not exactly rocket science. All Rights Reserved.