Dear Raju
Sand stone flooring is of three types one is Fine Dressed Sand Stone flooring second is Fine Derred and Rubbed Sand Stone flooring and third is Rough Dressed Sand Stone fooring generally used in slopes or in ramps.Sand stone laid with cement and coarse sand 1;3 ratio on base coat, joints are filled with cement shullary mixed with pigment and after curing finished as per requirement.
Cost differ from quality to quality and fixing place. In general its cost is rs 30-00 per sft.
Maintinance is general for all floors, Care should be taken that to avoid acidicmaterial on floor, avoid heay object dragging and avoid breaking by heavy objects etc.