The invention relates to a phosphate salt or a nitrate salt of 4 (R) 6 7 dihydro 5H pyrrolo[l 2 c]imidazol 5 yl 3 fluoro benzonitrile having following formula: especially in crystalline form and specific forms of these salts as well as related invention embodiments. The salts and salt forms allow for the prophylactic and/or therapeutic treatment of aldosterone synthase and/or aromatase mediated diseases or disorders such as Cushing s disease.