Adamite (Manganoan) on Goethite
Ojuela Mine, Mapimi, Durango, Mexico
Small Cabinet, 7.9 x 3.8 x 3.4 cm
Ex. Richard Heck
Unusual! This is a superbly crystallized and arranged specimen of manganoan adamite in which the adamite crystals show a gradation within them from adamite to manganoan-adamite. A concave matrix of ocherous limonite is supplanted by beautiful velvety spheres of black goethite, to 5 mm across. Emplaced on the goethite and a thin septa of limonite host rock are sprays of lustrous and translucent, bicolored, colorless to lavender-purpley, manganoan adamite. the pinwheel spreays reach nearly an inch, to 2.2 cm across. The adamite is colorless at the core and at the termination grades to a magnificent, lavender. All the adamite is lustrous and sparkling! The contrast in color and textures between the limonite, goethite, and the biclored adamite is just breathaking on this superb old specimen probably from the early 1980s adamite finds here.