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Spodumene

Spodumene is a lithium aluminum silicate (LiAlSi2O6) belonging to the clinopyroxene group, prized both as a critical lithium ore and as the source of some of the finest colored gem crystals in mineralogy. Named from the Greek for "burnt to ashes" and first described from Utö, Sweden, it forms elongated, deeply striated prismatic crystals in lithium-rich LCT (lithium-cesium-tantalum) pegmatites, typically alongside quartz, albite, petalite, eucryptite, lepidolite, and beryl. Its two cleavage directions are famously perfect, making faceted stones fragile but giving matrix specimens a sharp, glassy brilliance collectors seek out.

Three color varieties define the gem side of the species: pink-to-violet kunzite, colored by trace manganese and named in 1902 for gemologist George F. Kunz; emerald-green hiddenite, colored by chromium and first found near Stony Point and the town of Hiddenite in Alexander County, North Carolina; and yellow triphane. All three display strong pleochroism, shifting from near-colorless along one axis to their deepest hue along another. Classic kunzite localities include the Pala district of San Diego County, California — home to the Pala Chief Mine, Oceanview Mine, and Katerina Mine — plus Minas Gerais in Brazil and Anjanabonoina in Madagascar's Sahatany Valley. The single most important modern source, however, is the Nuristan and Kunar pegmatite belt of Afghanistan, including the Paron, Kolum, and Mawi deposits, where enormous, intensely colored kunzite crystals are still hand-mined from remote Hindu Kush valleys. True hiddenite remains far rarer, essentially confined to its North Carolina type locality, while green spodumene from Brazil and Afghanistan lacking chromium is not considered genuine hiddenite by strict definition.

Beyond its gem varieties, spodumene is legendary for producing some of the largest crystals ever recorded in nature: the Etta Mine near Keystone in the Black Hills of South Dakota yielded single crystals up to 14.3 meters (47 feet) long and roughly 90 tons in weight, alongside other historic American localities such as the Harding Mine in New Mexico and the Foote Mine at Kings Mountain, North Carolina. Today the Greenbushes pegmatite in Western Australia and Congo's Manono deposit anchor global lithium production, but for collectors it is the gemmy, bicolored, or sharply terminated crystals — whether lilac Afghan kunzite, chromium-green Carolina hiddenite, or massive striated specimens from classic pegmatite fields — that make spodumene a cornerstone of any serious pegmatite mineral collection.

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