[meteorite-list] SNC varification

[Gerald Flaherty]

List, can some one help me out on the third[and more if available] 
varification process to authenticate Martian meteorites.
1. identical match of gases with Martian atmosphere.
2. relatively[1.? billion]young crystalization age.
3.??
Thanks in advance. I should have asked this question last week BEFORE 
addressing a school group but I "thought" I would remember all three. I know 
I should reference this out but my time is thin.
Jerry Flaherty