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2. Lonsdaleite - Wikipedia

   en.wikipedia.org/wiki/Lonsdaleite

   In diamond, all the carbon-to-carbon bonds, both within a layer of rings and between them, are in the staggered conformation, thus causing all four cubic-diagonal directions to be equivalent; whereas in lonsdaleite the bonds between layers are in the eclipsed conformation, which defines the axis of hexagonal symmetry.

3. Allotropes of carbon - Wikipedia

   en.wikipedia.org/wiki/Allotropes_of_carbon

   Lonsdaleite is an allotrope sometimes called "hexagonal diamond", formed from graphite present in meteorites upon their impact on the earth. The great heat and pressure of the impact transforms the graphite into a denser form similar to diamond but retaining graphite's hexagonal crystal lattice .

4. Allotropy - Wikipedia

   en.wikipedia.org/wiki/Allotropy

   Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in crystalline structure.. Allotropy or allotropism (from Ancient Greek ἄλλος (allos) ' other ' and τρόπος (tropos) ' manner, form ') is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements.

5. Material properties of diamond - Wikipedia

   en.wikipedia.org/wiki/Material_properties_of_diamond

   Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. It is a crystal that is transparent to opaque and which is generally isotropic (no or very weak birefringence). Diamond is the hardest naturally occurring material known.

6. Category:Allotropes - Wikipedia

   en.wikipedia.org/wiki/Category:Allotropes

   This page was last edited on 22 December 2021, at 07:21 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

7. Category:Allotropes of carbon - Wikipedia

   en.wikipedia.org/wiki/Category:Allotropes_of_carbon

   العربية; বাংলা; Беларуская; Беларуская (тарашкевіца) Български; Català; Чӑвашла; Čeština

8. Cubic zirconia - Wikipedia

   en.wikipedia.org/wiki/Cubic_zirconia

   One face of an uncut octahedral diamond, showing trigons (of positive and negative relief) formed by natural chemical etching. Hardness: cubic zirconia has a rating of approximately 8 on Mohs hardness scale vs. a rating of 10 for diamond. [1] This may cause dull and rounded edges in CZ facets; the edges of diamond facets are much sharper by ...

9. Superdense carbon allotropes - Wikipedia

   en.wikipedia.org/wiki/Superdense_carbon_allotropes

   The following allotropes belong to the second group: MP8, [8] OP8, [8] SC4, [9] BC-8 [10] and (9,0). [11] These are hypothetically quasi-stable at the high pressure. BC-8 carbon is not only a superdense allotrope but also one of the oldest hypothetical carbon structures; initially it was proposed in 1984 in the work R. Biswas et al. [10] The MP8 structure proposed in the work J. Sun et al. [8 ...