EXHIBIT 31.2  RULE 13a-14(a)/15d-14(a) CERTIFICATION  I, Douglas T. Dietrich, certify that:  1.  I have reviewed this Annual Report on Form 10-K of Minerals Technologies Inc.;  2.  Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material  fact necessary to make the statements made, in light of the circumstances under which such statements were made, not  misleading with respect to the period covered by this report;  3.  Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in  all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the  periods presented in this report;  4.  The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and  procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as  defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:  (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be  designed under our supervision, to ensure that material information relating to the registrant, including its  consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in  which this report is being prepared;  (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting  to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial  reporting and the preparation of financial statements for external purposes in accordance with generally accepted  accounting principles;  (c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report  our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period  covered by this report based on such evaluation; and (th e registrant’s fourth fiscal quarter in the case of an annual  report)  (d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred  during the registrant's most recent fiscal quarter  (the registrant’s fourth fiscal quarter in the case of an annual  report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over  financial reporting; and (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial  reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and  report financial information; and (b) Any fraud, whether or not material, that involves management or other employees who have a significant role  in the registrant's internal control over financial reporting.  5.  The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control  over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors:  Date: February 21, 2014  Douglas T. Dietrich  Senior Vice President - Finance and Treasury,  Chief Financial Officer  /s/  Douglas T. Dietrich 