  We present ISO photometric and spectroscopic observations of a sample of 57
bright Asymptotic Giant Branch stars and red supergiants in the Large
Magellanic Cloud, selected on the basis of IRAS colours indicative of high
mass-loss rates. PHOT-P and PHOT-C photometry at 12, 25 and 60 $\mu$m and CAM
photometry at 12 $\mu$m are used in combination with quasi-simultaneous
ground-based near-IR photometry to construct colour-colour diagrams for all
stars in our sample. PHOT-S and CAM-CVF spectra in the 3 to 14 $\mu$m region
are presented for 23 stars. From the colour-colour diagrams and the spectra, we
establish the chemical types of the dust around 49 stars in this sample. Many
stars have carbon-rich dust. The most luminous carbon star in the Magellanic
Clouds has also a (minor) oxygen-rich component. OH/IR stars have silicate
absorption with emission wings. The unique dataset presented here allows a
detailed study of a representative sample of thermal-pulsing AGB stars with
well-determined luminosities.
