Mammoth and Black-jet Necklace 001

150.00

Mamoth Ivory necklace with Asturian Black-jet and Silver beads.

Closure: 925 Silver.

1 in stock

SKU: mmaz001cll Category:

MAMMOTH IVORY

Natural Mammoth Ivory

HARDNESS: 2 – 3
DENSITY: 1,7 – 2 g/cm³
ÍNDICE DE REFRACCIÓN: 1.535 a 1.570
COLOR: White, creamy
FLUORESCENCE: Violet blue
CRYSTALLIZATION: Amorphous
TRANSPARENCY: Translucent to opaque
COMPOSICIÓN: 25% organic material and 75% apatite

With an age of between 10,000 and 15,000 years; the tusks of mammoth ivory come from the Siberian steppe, where the cold has kept its properties intact. The melting and erosion of permafrost are contributing to their release. Since the ban, a fortunate but insufficient measure, of trading in elephant ivory, the use of mammoth ivory has increased. The two types of ivory can be differentiated thanks to the drawings they present in the fangs (Schreger lines).

Black-Jet

Natural Black Jet

HARDNESS: 3 – 4
DENSITY: 1,2 – 1,3 g/cm3
SCRATCH: Dark brown
COLOR: Bright black
BRIGHTNESS: Vitreous
EXFOLIATION- FRACTURE: Concoidea
CRYSTALLIZATION: Orthorhombic system
TRANSPARENCY: Opaque
LUMINESCENCE: Yellowish green

Black-Jet has a compact conformation, is soft to the touch, light and quite hard. In Asturias it is called Acebache or Azebache. The best jet in the world, along with Whithby, is in Asturias in the Jurassic Coast, between Gijón and Ribadasella, with a texture, an intense color and incomparable hardness. Recent studies carried out by a research team of the University of Oviedo, show that the Asturian black-jet comes from a family of Jurassic trees, extinct 65 million years ago.