This very important rarity specimen features a SHARP, 1.3-cm-long cumengeite crystal perched on SOLID matrix. Very few matrix cumengeites exist. Of them, Most such specimens are on stabilized (glued) matrix. This is not. Furthermore, this crystal has actual luster whereas most are a bit matte in finish. A sharp, important crystal overall. The associated green mineral is atacamite and the matrix is actually a fairly solid and very hefty chunk of anglesite. Rare and important addition to any Mexican or rarities suites!