Each kind of mineral has its own structure and chemicals.

VOA: special.2009.11.17

The Lisbon Treaty is set to tighten the existing structure of the European Union to strengthen its leadership and international clout.

VOA: standard.2009.10.02

Cordesman points out that Iran's constitution, if followed properly, provides a means of change and reform, if indeed parties are willing to work within its structure.

VOA: standard.2010.06.11

It has its own structure and set of rules that apply in it."

VOA: standard.2010.07.16