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Since 1975, alexandrite [Be(Al2-xCrx)2O4], the chromium-bearing crysoberyl variety, has been exploitedfrom alluvial and paleo-alluvial deposits in the Malacacheta region. The alluvial deposits consist ofresedimented gravel along the present drainage streams. The paleo-alluvial deposits are richer in alexandrite,and show well-developed soil horizons covering the alexandrite-bearing gravel layer. Alexandrite grainsshow angular shapes with very sharp edges, suggesting transport for shortdoi:10.18285/geonomos.v8i1.147 fatcat:dylljpbvv5cmve3wiu7pk52lom