Greetings Maurizio: Those look a lot like Al Haggounia 001, the paleo/fossil meteorite. A rare EL3 type (enstatite) that is very inexpensive due to the massive TKW (total known weight) http://www.ebay.com/itm/AL-HAGGOUNIA-001-Stony-Meteorite-Fragments-8-1g-/400175463637 Phil Whitmer Joshua Tree Earth & Space Museum