1.   The particular clays he has in mind do exist in many different crystalline forms.

2.   A compound which can exist in two or more crystalline forms is said to exhibit polymorphism.

3.   Quartz is a crystalline form of silica.

4.   Sulphur exists in two crystalline forms --orthorhombic or monoclinic --depending on the temperature.

5.   Both crystalline forms are examples of molecular crystals.

6.   Elements which exist in more than one crystalline form are said to exhibit allotropy.

7.   When an element exists in more than one crystalline form only one of which is stable it is said to exhibit monotropy.

8.   Altus chemically modifies the enzyme so that it always stays in the crystalline form.

9.   Lanciano said the patent covered the transformation of any enzyme into a crystalline form.

10.   The brittlestars secrete a crystalline form of calcium carbonate called calcite and organize it to make crystals in any shape or form.