[meteorite-list] Fake meteorite

[m.mackintosh]

Dear Meteorite list,

First of all I would like to thank the three people who very kindly sent me 
advice about E-Bay and possible fake emails.

I now have another problem, which perhaps someone could give me advice 
about:

I recently bought a Sikhote Aline Meteorite with quote- '' typicl fresh 
blue-black fusion crust ''

However the so-called blue-black fusion crust rubs off with only a finger 
nail pressure revealing shiny metal underneath !!!

Could someone tell me if this is a common and normal accurance ?

The seller from Florida issued me with a very nice 'Certificate of 
Authenticity', and the meteorite was not cheap !

With best wishes,

Moray