lonsdaleite
hexagonal diamond

Therefore, all properties of lonsdaleite are close to those of diamond.

In lonsdaleite, some rings are in the boat conformation instead.

Additionally, carbon polymorphs even harder than lonsdaleite have been discovered in the crater.

These so-called lonsdaleite nanodiamonds have been found only in meteorites or impact craters.

Lonsdaleite, for instance, is harder than cubic diamond.

Under some conditions, carbon crystallizes as lonsdaleite.

Consequently, it has been suggested that "stacking disordered diamond" is the most accurate structural description of lonsdaleite.

Lonsdaleite occurs naturally in asteroids and cosmic dust and as a result of extraterrestrial impacts on Earth.

The rare wurtzite BN modification is similar to lonsdaleite and may even be harder than the cubic form.

From theoretical considerations, lonsdaleite is expected to be harder than diamond, but the size and quality of the available stones are insufficient to test this hypothesis.

High-resolution imaging and spectroscopy identified carbon minerals such as diamond, lonsdaleite and graphite.

However, there is no way at the present to compare them to the artificial ultra-hard diamonds known as lonsdaleite and boron nitride, Ferroir said.

The reported evidence included nanodiamonds (including the hexagonal form called lonsdaleite), carbon spherules, and magnetic spherules.

Lonsdaleite was first identified in 1967 from the Canyon Diablo meteorite, where it occurs as microscopic crystals associated with diamond.

Lonsdaleite: a rare type of diamond, also called a hexagonal diamond, only found in non-terrestrial areas such as meteorite craters.

Lonsdaleite, an allotrope of carbon, was named in her honour; it is a rare harder form of diamond found in meteorites.

Analyzing the sediment, researchers said they identified an impact form of nanodiamonds called lonsdaleite that could not be formed through volcanic or other natural terrestrial processes.

Many of the diamonds at Popigai contain crystalline lonsdaleite, an allotrope of carbon that has a hexagonal lattice.

Lonsdaleite is a hexagonal allotrope of the carbon allotrope diamond, believed to form from graphite present in meteorites upon their impact to Earth.

A second form called lonsdaleite, with hexagonal symmetry, has also been found, but it is extremely rare and forms only in meteorites or in laboratory synthesis.

Naturally occurring lonsdaleite has also been identified in non-bolide diamond placer deposits in the Sakha Republic.

Pure, laboratory-created lonsdaleite is 58% harder than ordinary diamonds, though it is unknown whether the natural, impure examples at Popigai show similar characteristics.

Lonsdaleite in particular is found in carbon-rich material subjected to a shock wave, and is typically formed in meteorite impacts.

A quantitative analysis of the X-ray diffraction data of lonsdaleite has shown that about equal amounts of hexagonal and cubic stacking sequences are present.

The wurtzite BN form (w-BN) has similar structure as lonsdaleite, rare hexagonal polymorph of carbon.