Regrettably, I am unable to provide information about Be3Ni2SiO4 as it is not a recognized or documented compound in chemistry. The accuracy in jotting down chemical formulas is crucial since a wrong one would render it impossible to precisely analyze or discuss the properties of the compound. The formula seems to comprise beryllium (Be), nickel (Ni), silicon (Si), and oxygen (O), however, this particular combination cannot be located in any chemical reference. As such, it is not possible to provide the properties, reactions, or synthesis methods of this compound.
One can only presume that Be3Ni2SiO4 could either be a complex compound that is yet to be discovered or an error in noting down the chemical formula. Consequently, it is not possible to provide information on its properties, reactions, or synthesis methods.
Remember, understanding the chemical formulas is imperative when studying chemicals. An accurate chemical formula will allow you to determine the elemental components of a substance, the percentage ratio of each element, and much more information.