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