Amethyst Cluster
Amethyst Cluster
Amethyst is a variety of quartz known for its brilliant purple crystals.
The purple color is produced by trace iron inclusions in the crystal structure which have lost an electron due to gamma irradiation. This tiny change results in hues that can range from pale lilac to deep reddish purple.
Amethyst typically forms in volcanic, igneous, and certain metamorphic rocks, as those contain enough radioactive trace elements for sufficient irradiation to produce the required change in iron atoms. Quartz containing nonirradiated iron is called eisenkiesel.
Heating amethyst will change the color from purple to clear and then to yellowish. Heat treated amethyst are often misidentified as citrine.
Amethyst can fade if overexposed to light and can be artificially darkened with adequate irradiation.
Polished amethysts are widely sold as gemstones for jewelry and have been used in a variety of decorative ways for thousands of years.
Size: 1" and up clusters/crystals
The pictures are representative of the specimens you will receive.
- Research Card
Couldn't load pickup availability









Collections containing this item: Bestsellers | Geology | Newest Listings | Rocks, Crystals, & Minerals | Sale Items |
AUTHENTICITY GUARANTEED
We only list verified authentic items. We work with reputable collectors, and regularly consult with our network of scientists and experts.
If we aren't 100% confident, it doesn't make it on our site.
-
Free Worldwide Shipping
Orders over $50 qualify for free US shipping.
Orders over $100 qualify for free global shipping. -
Secure Payments
Pay how you like: credit card, PayPal, After Pay, Shop Pay, Apple/Google/Meta Pay, crypto & more.
-
Simple Returns
Change your mind? No problem. Enjoy easy returns within 30 days.
similar items_
WE TAKE SCIENCE SERIOUSLY
You deserve better than craft store science products. And we think learning is more impactful when you're holding a tangible piece of what you're learning about. That's why Stemcell exists.
We're dedicated to providing the best scientific products available—whether they're fragments of scientific importance, experimental activities, or just interesting things that scratch your curiosity itch.
With every new product launch, our list of new ideas gets longer rather than shorter. So check in often for our latest projects, and thanks for being a part of our endeavor to make the world a smarter place to live.
Believe in yourself; for everything else, there's science.
— TERRY MUDGE, FOUNDER & SCIENTIFIC DIRECTOR