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An outstanding cabinet specimen of sharply defined "dogtooth" scalenohedral Calcite from the historic Tres Marias Mine. This piece boasts impressive, sharp geometry and a beautiful skeletal structure that catches light flawlessly from every angle. Weighing a substantial 640 grams, this cluster represents a classic era of Mexican mineralogy. As the Tres Marias Mine is no longer operational, specimens of this size and quality are increasingly difficult to source, making this an excellent addition for the advanced collector. Specimen DetailsMineral: Calcite (Scalenohedral / Dogtooth Habit).Locality: Tres Marias Mine, Santa Eulalia Mining District, Chihuahua, Mexico.Dimensions: 13.0 x 10.7 x 6.1 cm (5.1 x 4.2 x 2.4 in).Weight: 640g (22.58 oz). All Gatsby Gems specimens are hand-selected for scientific accuracy and aesthetic brilliance. Each piece includes a locality label and is professionally packaged for secure addition to your gallery.