Pyromorphite

specimen number:
1655488

location:
Broken Hill, New South Wales, Australia

description:
Sparkling crystals of pyromorphite averaging 0.1 cm in size across the top of matrix. In good condition.

The Broken Hill mining district in New South Wales, Australia, is home to one of the largest and most famous silver-lead-zinc deposits in the world. Geologically, it is a Proterozoic-aged sedimentary exhalative (SEDEX) or "Broken Hill Type" (BHT) deposit that underwent intense granulite-facies metamorphism and multiple stages of folding approximately 1.6 billion years ago. The ore body, known as the "Line of Lode," is a boomerang-shaped massive sulfide deposit hosted within the highly deformed rocks of the Willyama Supergroup. Historically, the outcrop was discovered in 1883 by boundary rider Charles Rasp, leading to the formation of the Broken Hill Proprietary Company (BHP), which eventually became a global industrial giant. The town of Broken Hill grew rapidly around these mines, becoming a pioneer in labor movements and mining technology. Over more than 140 years of continuous operation, the district has produced staggering quantities of metal and remains an active mining center today.

The mineralogy of Broken Hill is incredibly complex, with over 300 mineral species identified, including many that were first discovered there. The secondary oxidation zone, which extended to depths of nearly 100 meters, produced a spectacular array of minerals that are now centerpieces in museums worldwide. Famous specimens include brilliant "arrowhead" cerussite crystals, yellow-green bromargyrite, and the iconic "raspberry-red" rhodonite crystals embedded in sparkling galena. The deep primary ore is dominated by a mixture of galena and sphalerite, often associated with massive garnet-rich rocks known as "garnet sandstone." Because of its unique combination of ancient age, high-grade metamorphism, and extreme mineral diversity, Broken Hill is considered a "mineralogical wonderland" and a foundational site for Australian economic geology.

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