Two sites of Mn

2+

(Mn

2+

)

sub

and (Mn

2+

)

int

were found by photoluminescence and excitation spectra in ZnS:Mn

2+

nanoparticles and Pyrex glasses composite. Electron paramagnetic resonance(EPR) experiments confirmed further that there are (Mn

2+

)

sub

(Mn

2+

)

int

and Mn clusters formed by strong dipole-dipole interactions. The possibilities to form Mn clusters are larger than to form the other two sites. The increases in g

1

factors and superfine structure constants |A| with decreasing the diameters of the nanocrystals were observed also. The g shift due to the hybridization between s p states of ZnS and d states of the Mn ions by carrier quantum confinement ( R

<

a

B

) effects were discussed and analyzed by Cardona model using

k·p

perturbation.