SECURITIES EXCHANGE COMMISSION

                              Washington, DC 20549

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 4 )


                           MINERALS TECHNOLOGIES, INC.
                                (Name of Issuer)

                                     Common
                         (Title of Class of Securities)

              Date of Event Which Requires Filing of this Statement
                                March 19, 2001

                 Check the appropriate box to designate the rule
                    pursuant to which this Schedule is filed

                                 X Rule 13d-2(b)
                                    603158106
                                 (CUSIP NUMBER)








1) Name of Reporting Pioneer Person Investment Management Inc. IRS Identification 13-1961193 No. of Above 2) Check the Appropriate Box (a) of A Member of Group (See Instructions) (b) X 3) SEC Use Only 4) Citizenship of Place of Organization Delaware Number of (5) Sole Voting Shares Power 1008147 Beneficially Owned (6) Shared Voting by Each Reporting Power 0 Person With (7) Sole Dispositive 1008147 Power (8) Shared 0 Dispositive Power 9) Aggregate Amount Beneficially 1008147 Owned by Each Reporting Person 10 Check if the aggregate Amount in Row (9) Exclude Certain Shares (See Instructions) 11 Percent of Class Represented By Amount in Row 9. 4.77% 12) Type of Reporting Person (See Instructions) IA

Item 1(a) Name of Issuer. MINERALS TECHNOLOGIES, INC. Item 1(b) Address of Issuer's Principal Executive Offices: Mr.Neil M. BardachChief Financial Officer MINERALS TECHNOLOGIES, INC. 405 Lexinton Avenue, 19th Flr. New York, NY 101741901 Item 2(a) Name of Person Filing: Pioneer Investment Management, Inc. Item 2(b) Address of Principal Business Office: 60 State Street, Boston, MA 02109 Item 2(c) Citizenship: State of Delaware Pioneer Investment Management Item 2(d) Title of Class of Securities:. Common Stock Item 2(e) CUSIP Number:. 603158106 Item 3 The person filing this statement pursuant to Rule 13d-1(b) or 13d-2(b) is: (d) Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940.

Item 4. Ownership. (a) Amount Beneficially Owned: 1008147 (b) Percent of Class: 4.77% (c) Number of shares as to which such person has (i) sole power to vote or to direct the vote (ii) shared power to vote or to direct vote 0 (iii) sole power to dispose or to direct disposition of 1008147 (iv) shared power to dispose or to direct disposition 0 Item 5. Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date Hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check here: X Item 6. Ownership of More than Five Percent on Behalf of Another Person. Inapplicable. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported On By the Parent Holding Company. Inapplicable.. Item 8. Identification and Classification of Members of the Group. Inapplicable. Item 9. Notice of Dissolution of the Group. Inapplicable.

Item 10. Certification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transactions having such purposes or effect. After reasonable inquiry and to the best of my knowledge and believe, I certify that the information set forth in this statement is true, complete and correct. March 19, 2001 Date /s/Dorothy B. Bourassa Secretary Signature