Encyclopedia > Lonsdaleite

  Article Content


Lonsdaleite is a hexagonal polymorph of the carbon allotrope diamond, believed to form when meteoric graphite falls to Earth. The great heat and stress of the impact transforms the graphite into diamond, but retains graphite's hexagonal crystal lattice. Lonsdaleite is currently found only in Barringer Crater (also known as Meteor Crater) in Arizona and at Canyon Diablo[?]. It was first discovered in 1967.

Lonsdaleite is also known as "hexagonal diamond." It has an index of refraction from 2.40 to 2.41, a density from 3.2 to 3.3, and a hardness of 3.00.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
TLAs from UAA to XZZ

... AAA to DZZ Table of all possible TLAs from EAA to HZZ Table of all possible TLAs from IAA to LZZ Table of all possible TLAs from MAA to PZZ Table of all possible ...