Quartz (irradiated)

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An attractive glassy deep smoky gemmy quartz crystal. This has been irradiated to produce the dark color. In good condition. The Hot Springs mining district in Garland County, Arkansas, is a globally famous locality for high-purity rock crystal quartz specimens. Geologically, the region sits within the Ouachita Mountains, where intense Pennsylvanian-age tectonic folding and faulting fractured deep Paleozoic sedimentary rock sequences. Hydrothermal fluids rich in silica circulated through these fractured sandstones and shales, depositing exceptionally clear quartz crystals within large open vugs. Small-scale mining for quartz specimens began in the early 1800s, while systematic mining for crystals and industrial-grade silicon expanded rapidly in the early twentieth century, particularly during World War II for radio oscillators. Commercial open-pit quartz mining and artisanal specimen digging have remained highly active continuously for over a century, with operations extending well into the 2020s. Irradiated quartz is a man-created mineral variant produced by exposing natural, clear rock crystal quartz to artificial ionizing radiation, such as gamma rays or electron beams in a laboratory setting. This process alters the oxidation state of trace aluminum impurities embedded within the quartz crystal lattice, effectively replicating the natural radioactive processes that occur underground over millions of years. The artificial exposure results in the rapid development of a deep smoky brown, near-black, or greenish-yellow color throughout the crystal while maintaining its original luster and structural integrity. Often created to simulate natural smoky quartz, these treated specimens are widely distributed in the commercial gemstone and novelty markets, though ethical sellers explicitly disclose the laboratory treatment to differentiate them from naturally colored crystals.