Noun : Graphite and diamond are allotropes of carbon.    From Dictionary.com. 

Buckminister Fuller and Richard Smalley in terms of allotrope.    From Wordnik.com.  [The Lopsided Universe] Reference

Moving to polytopes or allotrope seem to have values in science?.    From Wordnik.com.  [The Lopsided Universe] Reference

Carbon nanotubes are molecular-scale tubes usually made of a carbon allotrope.    From Wordnik.com.  [Original Signal - Transmitting Gadgets] Reference

A new fifth allotrope of carbon was recently produced, a spongy solid called a magnetic carbon “nanofoam” that is extremely lightweight and attracted to magnets.    From Wordnik.com.  [Carbon] Reference

The fourth allotrope is called explosive Antimony.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

A new (fifth) allotrope of carbon was recently found.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Peter from Aston Rowant e-mails in on that allotrope business.    From Wordnik.com.  [BBC News - Home] Reference

The grey allotrope of Antimony is the only form that can be found in nature and that is stable.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Edward, TMS inbox: "0312 Isotope is not the word you're looking for - you are thinking of allotrope.".    From Wordnik.com.  [BBC News - Home] Reference

The color of the grey allotrope, of metallic Antimony, is a silvery white and has a purplish or bluish shine.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Carbon nanotubes (aka: "buckytubes") are an allotrope of a carbon molecule which have cylindrical nanostructures.    From Wordnik.com.  [EzineArticles] Reference

The black allotrope is a shapeless black powder that, when exposed to air at an atmospheric temperature oxidizes.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Take all this stuff, for instance; especially their ability to transform iron into a fluid allotrope, and in that form to use its intra-atomic energy as power.    From Wordnik.com.  [Triplanetary] Reference

Text: MUMBAI: Thirty-four-year-old Jivraj Patel has lost the glitter of his diamonds at a very early age, Jivraj could tell - merely by feeling the sharp unpolished edges of carbon allotrope - the.    From Wordnik.com.  [WN.com - Articles related to Businessmen return to diamond industry] Reference

Since I think the stated number is correct only for one allotrope of Carbon, and is the temperature of sublimation, it is important to have some notes added to the data to clarify what it is saying.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

ADNRs, are an allotrope of carbon believed to be the hardest and least compressible known material, as measured by its isothermal bulk modulus; aggregated diamond nanorods have a modulus of 491 gigapascals (GPa), while a conventional diamond has a modulus of 442 GPa.    From Wordnik.com.  [Yahoo! Answers: Latest Questions] Reference

December 26th, 2005 at 3: 08 pm PST allotrope.    From Wordnik.com.  [Mash-up: Placeopedia] Reference