  We have carried out mid-infrared N-band spectroscopic observations of the T
Tauri star Hen 3-600A in the TW Hydra association with the COMICS on the 8.2m
Subaru Telescope and found structured features in its spectrum. These
structured features are well explained by a combination of crystalline
forsterite, crystalline enstatite, silica and glassy olivine grains.
  Among intermediate-mass young stellar objects (YSOs), crystalline silicates
have already been detected, but no firm detection has been reported so far for
low-mass YSOs such as T Tauri stars. This is the first clear detection of
crystalline silicates in low-mass YSOs and shows that the crystallization event
occurs even in the protoplanetary disk of low-mass YSOs in the T Tauri phase.
The physical processes leading to the inferred dust composition in the
Hen3-600A system may be analogous to those occured in the early epoch of the
Solar system.
