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 .