Specimen at a glance
| Mineral | Quartz (var. amethyst) |
|---|---|
| Chemistry | SiO2 |
| Mohs hardness | 7 |
| Crystal system | Trigonal |
| Form | Crystal cluster |
| You receive | The exact specimen pictured |
About this specimen
This deep purple amethyst cluster comes from a vintage mineral collection, meaning it was acquired and kept by a previous collector some years ago rather than being a newly mined piece — a bit of provenance that appeals to collectors who value a specimen’s history alongside its mineralogy. Amethyst is the purple variety of quartz, colored by trace iron impurities altered by natural irradiation, and it typically grows as radiating clusters of parallel points inside gas cavities in volcanic rock.
This cluster shows well-formed points in rich violet tones with natural gray-white banding at the base, where the crystal points meet the matrix they grew from. At Mohs hardness 7, it’s durable and holds up well to normal display and handling; a soft, dry cloth keeps it looking its best.
Amethyst is prized for its striking color and remains a favorite among both crystal collectors and home decorators. Approximately 3.5 x 2.5″, this piece works as a strong statement item with the added appeal of collection provenance behind it.
Inside the Amethyst
The purple in your palm is quartz plus two accidents of geology — trace iron and millions of years of natural background radiation.
The story: Amethyst forms the same way most quartz crystals do — silica-rich fluid cooling slowly inside a gas cavity in volcanic rock — except this fluid carried a trace of iron. Left alone for long enough, natural background radiation in the surrounding rock converts that iron into the color centers that give amethyst its purple, often banding from pale lilac to deep violet within a single point.
Why collectors chase it: Depth and evenness of color are what separate an ordinary piece from a great one — the deepest, most saturated purple comes from a handful of localities worldwide, and Brandberg, Namibia (the source of several pieces in this shop) is prized for sharp, gemmy double-terminated points, sometimes with smoky phantom zoning inside the same crystal.
Care: Quartz is tough (Mohs 7), but amethyst’s color itself is the delicate part: sustained direct sunlight can fade it over years, and real heat (300–400°C) permanently turns it citrine-yellow. Keep it out of a sunny windowsill for long-term display and it will hold its color indefinitely.
Amethyst: the science
- Take away either ingredient, the iron or the radiation, and the crystal stays colorless. Both are needed for purple.
- Amethyst’s color is heat-sensitive. At roughly 400 to 500 °C it turns yellow or orange, which is how most commercial citrine is made.
- Long exposure to strong sunlight can slowly fade amethyst, so collectors keep their best pieces out of the window.
Go deeper
Want the full story on amethyst: how it forms, how to identify it, and what makes a great specimen?
Questions about this piece
What is amethyst?
Amethyst is purple quartz. Its color comes from trace iron in the crystal combined with natural radiation from the surrounding rock.
How hard is it, and how should I care for it?
It rates 7 on the Mohs scale. Mohs 7. Display away from direct sunlight to protect the color. Rinse in lukewarm water and air dry, and avoid heat.
Is this the exact piece I will receive?
Yes. This listing was photographed individually, and you receive the exact piece shown in the photos.
