Bolivian Ametrine A-Grade Hydrothermal Etched New Find- Anahí Mine | River Walkers Minerals

This specimen is a natural Bolivian ametrine from a freshly recent, limited find. It retains intact etched surfaces and beautifully vibrant color zoning.

The majority of ametrine specimens currently available worldwide were mined approximately 30 years ago and typically show significant damage, abrasion, or incomplete crystal preservation. In contrast, this piece retains sharp internal clarity, strong color zoning, and intact etched surfaces, qualifying it as A-Grade material.

Formation & Geology: 

Ametrine forms when a single quartz crystal grows under thermal and chemical conditions within a hydrothermal vein. Amethyst and citrine coloration result from iron impurities responding differently to localized temperature and oxidation states during crystal growth. Bolivia’s Anahí Mine is the only known locality where these conditions naturally coexist within one crystal.

The surface textures visible on this specimen are the result of natural hydrothermal etching, a post-growth process caused by hot, mineral-rich fluids partially dissolving the quartz. The etched surfaces preserve natural relief and depth that cannot be replicated artificially.

Rarity & Mining Context:

• Ametrine is found only in the deepest sections of the mine, embedded in compact mud layers rather than open crystal pockets.
• Accessing these zones is difficult and physically demanding.
• During a typical mining season, only one or two hydrothermal etched ametrine specimens are recovered, compared to large quantities of standard amethyst points.
• Most ametrine extracted globally is cut into cabochons or faceted stones, making intact, etched specimens particularly scarce.

Provenance:

This piece comes directly from the mine, obtained through the sole individual currently exporting this new material. He is my direct contact to the mine, and at present, the only person importing these etched specimens internationally. The material was shipped from Bolivia to Canada and then to the me in the United States without passing through secondary dealers.

Weight: 249 g

Dimensions: 3.8 × 2.1 × 1.6 in

Locality: Bolivia (Anahí Mine region)