Four Peaks Amethyst Mine
33.6844° N, 111.3257° W · ± 10 km
Amethyst from Arizona, United States, with photos of specimens from this locality.
Minerals found here
Amethyst at Four Peaks Amethyst Mine
Uneven purple zoning with reddish-brown hematite flakes, grown in brecciated quartzite
Photo: Robert M. Lavinsky · CC BY-SA 3.0 · Source
- Formula
- SiO₂
- Morphology
- Crystals in cavities and fractures
- Color / luster
- Range of purple shades with uneven colour zoning and variable transparency
- Associated minerals
- Hematite (as tiny reddish-brown flakes in the crystals)
- Twins
- Brazil-law twinning present
- Availability
- Scarce
- History
- Has produced gem amethyst for more than a century
Sources: SRC-107
Geology of the locality
- Setting
- Crystal-lined cavities and fractures in a brecciated quartzite
- Host rock
- Brecciated quartzite
- Region
- Arizona
- Country
- United States
Coordinates are those of Browns Peak, the summit of Four Peaks (Wikipedia), not of the mine itself, so accuracy is only +/- 10 km. GIA reports recovery continuing on a limited basis.
Sources
- SRC-107 · Article
Amethyst from Four Peaks, ArizonaLowell, G.R. (author as given in the URL; not verified) · 2004 · Gems & Gemology (Winter 2004) - SRC-108 · Website
Four PeaksWikipedia
Draft data from the Provenite workbook. Check entries against the cited sources before relying on them. Photos are open-licence images from Wikimedia Commons; the author and licence are given with each photo.