Locality: Ahumada Mine, Chihuahua, Mexico
Size: 72 mm x 38 mm x 47 mm (2.8 in. x 1.5 in. x 1.8 in.)
Weight: 147 g (5.2 oz.)
Endlichite, also known as arsenatian vanadinite, is a variety of vanadinite in which arsenic has taken the place of vanadium. This specimen has elongated chocolate brown crystals with flat terminations.