Knife block made of Nero Assoluto brushed with calcite crystal

Details

Beautiful orange glowing quartzite calcite cluster.

Not many have been found in this quality. Calcite clusters are formed when pure silica solution is constantly exposed to very specific conditions of pressure and temperature over a long period of time. Alpine rock crystals, for example, are formed in hydrothermal solutions that cool by 1 °C in 40,000 years. In their growth phase they often take breaks during which other minerals are deposited on the crystal surfaces. This piece is free of deposits, which increases its value, and is framed in gold by the Nero Assoluto, whose surface is brushed at the front, creating a beautiful contrast.

The Nero Assoluto natural stone is one of the most elegant of its kind. The black stone is a gabro, a magmatic stone of plutonic origin. Also known as plutonite, these stones are formed deep inside the earth, mainly in the oceanic crust. Among the gabbros, the Nero Assoluto Zimbabwe is a rare plutonic rock in the composition of a gabbro-plutonic stone. The special feature here is that this stone appears almost exclusively in black and is covered with tiny minerals.

Type of rock: Basalt

Age: Precambrian (covers the first 4 billion years of Earth’s history)

Rock group: igneous rocks

Appearance: Black, White Clouds, Fine Grained

Location: Mutoka, Zimbabwe

Acid resistance: The stone is resistant to acid attacks within normal limits.

Technical data: Nero Assoluto

Bulk density: 3.04 t/m³

Compressive strength: 228 MPa

Bending strength: 31 MPa

Water absorption: 0.11% by weight

Frost resistance: Frost resistant