Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Ebe e si enweta ya: A na-ahụkarị siderite n'ebe mmiri na-esi n'ebe mmiri na-asọpụta, ya na barite, fluorite, galena, na ndị ọzọ na-agakọkwa. Ọ bụkwa mineral diagenetic a na-ahụkarị na shales na sandstones, ebe ọ na-ekepụta oge ụfọdụ, nke nwere ike itinye ihe ndị e chekwara echekwa atọ. N'ime okwute sedimentary, siderite na-emekarị na omimi omimi na ihe mejupụtara ya na-ejikọtakarị na gburugburu ebe obibi nke sediments. Na mgbakwunye, ọtụtụ nyocha ndị na-adịbeghị anya ejirila ihe mejupụtara oxygen nke sphaerosiderite (ụdị jikọtara ya na ala) dị ka onye nnọchi maka isotopic nke mmiri meteoric n'oge na-adịghị anya mgbe nkwụnye ego.  Ajụjụ: Olee ebe a na-ahụkarị mineral ahụ?
shales na sandstones