Robuta

https://scirp.org/reference/referencespapers?referenceid=483757
Suresh Babu, D.S., Thomas, K.A., Mohan Das, P.N. and Damodaran, A.D. (1994), Alteration of ilmenite in the Manavalakurichi deposit, India. Clays and Clay...
suresh babumohan dasthomaskp