Nuummite Crystal Stone Jewelry Pendant

Reference id: 5L1k2hYpkwM 11984

Pendant of 2 natural Nuummite crystal stones separated by a hinge in a 925 silver plated frame. Discounted due to imperfect framing.

Measures 2 7/8 inches tall/long, 1 1/8 inch wide.

Nuummite is a rare metamorphic rock that consists of the amphibole minerals gedrite and anthophyllite. It is named after the area of Nuuk in Greenland.

Nuummite is usually black in color and opaque. It consists of two amphiboles, gedrite and anthophyllite, which form exsolution lamellae that give the rock its typical iridescence. Other common minerals in the rock are pyrite, pyrrhotite and chalcopyrite, which form shimmering yellow bands in polished specimens.  

In Greenland the rock was formed by two consecutive metamorphic overprints of an originally igneous rock. The intrusion took place in the Archean around 2800 million years ago and the metamorphic overprint was dated at 2700 and 2500 million years ago.

The rock was first discovered in 1810 in Greenland by the mineralogist K. L. Giesecke. In 2009, a new variety of nuummite was discovered in central Mauritania. Under its unofficial name Jenakite, this variety is distinctive due to the presence and high density of blue and green anthophyllite needle-like crystals. It has no golden anthophyllite needle-like crystals.  Nuummite from Greenland predominantly has golden and occasionally blue anthophyllite needle-like crystals.