  We present the detailed X-ray spectroscopy of Vela shrapnel A with the
XMM-Newton satellite. Vela shrapnel A is one of several protrusions identified
as bullets from Vela supernova explosion. The XMM-Newton image shows that
shrapnel A consists of a bright knot and a faint trailing wake. We extracted
spectra from various regions, finding a prominent Si Ly$_\alpha$ emission line
in all the spectra. All the spectra are well represented by the non-equilibrium
ionization (NEI) model. The abundances are estimated to be O$\sim$0.3,
Ne$\sim$0.9, Mg$\sim$0.8, Si$\sim$3, Fe$\sim$0.8 times their solar values. The
non-solar abundance ratio between O and Si indicates that shrapnel A originates
from a deep layer of a progenitor star. We found that the relative abundances
between heavy elements are almost uniform in shrapnel A, which suggests that
the ejecta from supernova explosion are well mixed with swept-up interstellar
medium.
