posted by Lena .
Would it be network, molecular, ionic or atomic?
This is one of those awkward to answer questions. Colloidal sulfur refers to sulfur that has been precipitated into water. Sulfur has a great many allotropes including S8 and less common S7, some linear and polymeric forms. These are all covalently bonded and I would say molecular structures. A network structure usually has a high melting point, S8 melting point is about 120C.
You might be intersted to know that there is a large number of names for sulfur in its various forms, see: