ADAMITE – Vivid Green Crystals, UV Fluorescent, Ojuela Mine, Mapimí, Mexico

This specimen showcases a fine cluster of lustrous green adamite crystals emerging from a richly colored, reddish-brown gossan matrix — one of the classic color combinations that has made adamite from the Ojuela Mine famous among collectors worldwide. Numerous small crystals surround several larger, well-formed prismatic individuals that dominate the center of the piece, giving the specimen excellent visual balance and a strong three-dimensional presence.

The intense green hue is typical of cuprian adamite, a variety in which trace amounts of copper substitute into the crystal structure and produce the vivid coloration that distinguishes Mapimí material from the more common yellow adamite found at other localities. The sharp contrast between the bright green crystals and the warm reddish matrix gives the piece a bold, eye-catching aesthetic that is highly sought after in both natural and ultraviolet light.

Under ultraviolet light the adamite crystals respond with an intense green fluorescence, a well-documented feature of material from this locality. This adds a further dimension of interest for collectors of fluorescent minerals, alongside the piece's natural visual beauty.

The Ojuela Mine, located near the town of Mapimí in Durango, Mexico, is considered one of the world's most important mineral specimen localities, having produced some of the finest adamite ever found. Large-scale commercial mining at Ojuela ceased in the mid-20th century, and today good specimens are recovered only sporadically through small-scale collecting activity, adding to the long-term appeal and collectibility of pieces such as this one.

Adamite is a zinc arsenate hydroxide that forms as a secondary mineral in the oxidized zones of zinc- and arsenic-bearing sulfide ore deposits, precipitating from mineral-rich fluids as the primary ores weather near the surface. The vivid green color seen in this specimen is caused by the substitution of trace amounts of copper into the crystal structure in place of zinc, producing the variety known as cuprian adamite — a coloration typical of, and highly prized from, the Ojuela Mine. The bright green fluorescence displayed under ultraviolet light is a separate phenomenon, caused by trace amounts of the uranyl ion [(UO2)2+] incorporated into the crystal lattice, which acts as a fluorescence activator; this uranyl-activated fluorescence is a well-documented characteristic of adamite from this locality, though its intensity can vary noticeably even between specimens from the same pocket.

• Formula: Zn2(AsO4)(OH)
• Key chemical elements: Zinc, Arsenic, Oxygen, Hydrogen, Copper
• Hardness (Mohs scale): 3.5
• Mineral class: Arsenates
• Crystal system: Orthorhombic
• Crystal habit: Prismatic crystals forming radiating clusters on matrix
• Formation: Secondary mineral formed by oxidation of zinc-arsenic sulfide ores
• Color: Green (cuprian variety), on a reddish-brown gossan matrix
• Fluorescence: Bright green under UV light, caused by uranyl ion activation

Did you know that the huge adamite deposit at the Ojuela Mine was only discovered in 1946, when collectors Dan Mayers and Francis Wise found a spectacular pocket of crystals now often referred to as the adamite grotto? This single find is responsible for most of the fine adamite specimens seen in collections around the world today.

The green coloration seen in specimens like this one is caused by traces of copper substituting into the adamite structure, a variety known among mineralogists as cuprian adamite. The Ojuela Mine has produced over a hundred different mineral species and is also the type locality for several rare minerals, including paradamite and ojuelaite.

In crystal healing traditions, Adamite is regarded as a stone of clarity, renewal and emotional balance. It is believed to help open the heart, encourage a positive outlook and support those seeking a fresh start, whether in relationships or personal growth.

The vivid green color of this specimen from the Ojuela Mine links it to the Heart chakra, traditionally associated with compassion and emotional healing, while its coppery origin is thought to enhance feelings of vitality and connection. Its striking fluorescent glow under ultraviolet light is said to symbolize inner illumination, supporting clarity of mind and spiritual awakening.

These interpretations are not scientifically proven.

Chakra: Heart, Third Eye

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