UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                             (Amendment No.     )
                                           -----


                          Minerals Technologies Inc.
                   ----------------------------------------
                               (Name of Issuer)


                                 Common Stock
                     ----------------------------------
                       (Title of Class of Securities)


                                   60315106
                     ----------------------------------
                                 (CUSIP Number)


                               December 31, 2000
           -------------------------------------------------------
           (Date of Event Which Requires Filing of this Statement)

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

                            [X] Rule 13d-1(b)
                            [ ] Rule 13d-1(c)
                            [ ] Rule 13d-1(d)

 The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which
would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).


- -------------------- CUSIP No. 60315106 13G - -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Artisan Partners Limited Partnership 39-1807188 - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see Instructions) (a)[ ] Not Applicable (b)[ ] - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ------------------------------------------------------------------------------- 5 SOLE VOTING POWER None NUMBER OF ------------------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY 1,315,832 OWNED BY ------------------------------------------------------------------ EACH 7 SOLE DISPOSITIVE POWER REPORTING None PERSON ------------------------------------------------------------------ WITH 8 SHARED DISPOSITIVE POWER 1,315,832 - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,315,832 - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see Instructions) Not Applicable - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 6.49% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (see Instructions) IA - -------------------------------------------------------------------------------

- -------------------- CUSIP No. 60315106 13G - -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Artisan Investment Corporation - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see Instructions) (a)[ ] Not Applicable (b)[ ] - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Wisconsin - ------------------------------------------------------------------------------- 5 SOLE VOTING POWER None NUMBER OF ------------------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY 1,315,832 OWNED BY ------------------------------------------------------------------ EACH 7 SOLE DISPOSITIVE POWER REPORTING None PERSON ------------------------------------------------------------------ WITH 8 SHARED DISPOSITIVE POWER 1,315,832 - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,315,832 - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see Instructions) Not Applicable - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 6.49% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (see Instructions) CO - -------------------------------------------------------------------------------

- -------------------- CUSIP No. 60315106 13G - -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Andrew A. Ziegler - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions) (a)[ ] Not Applicable (b)[ ] - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S.A. - ------------------------------------------------------------------------------- 5 SOLE VOTING POWER None NUMBER OF ------------------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY 1,315,832 OWNED BY ------------------------------------------------------------------ EACH 7 SOLE DISPOSITIVE POWER REPORTING None PERSON ------------------------------------------------------------------ WITH 8 SHARED DISPOSITIVE POWER 1,315,832 - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,315,832 - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see Instructions) Not Applicable - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 6.49% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (see instructions) IN - -------------------------------------------------------------------------------

- -------------------- CUSIP No. 60315106 13G - -------------------- - ------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Carlene Murphy Ziegler - ------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see Instructions) (a)[ ] (b)[ ] Not Applicable - ------------------------------------------------------------------------------- 3 SEC USE ONLY - ------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S.A. - ------------------------------------------------------------------------------- 5 SOLE VOTING POWER None NUMBER OF ------------------------------------------------------------------ SHARES 6 SHARED VOTING POWER BENEFICIALLY 1,315,832 OWNED BY ------------------------------------------------------------------ EACH 7 SOLE DISPOSITIVE POWER REPORTING None PERSON ------------------------------------------------------------------ WITH 8 SHARED DISPOSITIVE POWER 1,315,832 - ------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,315,832 - ------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see Instructions) Not Applicable - ------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 6.49% - ------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (see Instructions) IN - -------------------------------------------------------------------------------

Item 1(a) Name of Issuer: Minerals Technologies Inc. Item 1(b) Address of Issuer's Principal Executive Offices: 405 Lexington Avenue New York, NY 10174-1901 Item 2(a) Name of Person Filing: Artisan Partners Limited Partnership ("Artisan Partners") Artisan Investment Corporation, the general partner of Artisan Partners ("Artisan Corp.") Andrew A. Ziegler Carlene Murphy Ziegler Item 2(b) Address of Principal Business Office: Artisan Partners, Artisan Corp., Mr. Ziegler and Ms. Ziegler are all located at: 1000 North Water Street, #1770 Milwaukee, WI 53202 Item 2(c) Citizenship: Artisan Partners is a Delaware limited partnership Artisan Corp. is a Wisconsin corporation Mr. Ziegler and Ms. Ziegler are U.S. citizens Item 2(d) Title of Class of Securities: Common Stock Item 2(e) CUSIP Number: 60315106 Item 3 Type of Person: (e) Artisan Partners is an investment adviser registered under section 203 of the Investment Advisers Act of 1940; Artisan Corp. is the General Partner of Artisan Partners; Mr. Ziegler and Ms. Ziegler are the principal stockholders of Artisan Corp.

Item 4 Ownership (at December 31, 2000): (a) Amount owned "beneficially" within the meaning of rule 13d-3: 1,315,832 (b) Percent of class: 6.49% (based on 20,272,646 shares outstanding as of October 20, 2000) (c) Number of shares as to which such person has: (i) sole power to vote or to direct the vote: none (ii) shared power to vote or to direct the vote: 1,315,832 (iii) sole power to dispose or to direct the disposition of: none (iv) shared power to dispose or to direct disposition of: 1,315,832 Item 5 Ownership of Five Percent or Less of a Class: Not Applicable

Item 6 Ownership of More than Five Percent on Behalf of Another Person: The shares reported herein have been acquired on behalf of discretionary clients of Artisan Partners. Persons other than Artisan Partners are entitled to receive all dividends from, and proceeds from the sale of, those shares. None of those persons, to the knowledge of Artisan Partners, Mr. Ziegler or Ms. Ziegler, has an economic interest in more than 5% of the class. Item 7 Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person: Not Applicable Item 8 Identification and Classification of Members of the Group: Not Applicable Item 9 Notice of Dissolution of Group: Not Applicable 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 and are not held for the purpose of or with the the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Signature --------- After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: February 9, 2001 ARTISAN INVESTMENT CORPORATION for itself and as general partner of ARTISAN PARTNERS LIMITED PARTNERSHIP By: /s/ Andrew A. Ziegler --------------------- Andrew A. Ziegler President ANDREW A. ZIEGLER /s/ Andrew A. Ziegler --------------------- CARLENE MURPHY ZIEGLER /s/ Carlene Murphy Ziegler --------------------------

Exhibit Index ------------- Exhibit 1 Joint Filing Agreement dated as of February 9, 2001 by and among Artisan Partners Limited Partnership, Artisan Investment Corporation, Andrew A. Ziegler, and Carlene Murphy Ziegler

                                                              EXHIBIT 1

                       JOINT FILING AGREEMENT

   The undersigned hereby agree to the joint filing of the Schedule 13G
to which this Agreement is attached.


                Dated: February 9, 2001



                                 ARTISAN INVESTMENT CORPORATION
                                   for itself and as general partner of
                                   ARTISAN PARTNERS LIMITED PARTNERSHIP

                                 By:  /s/ Andrew A. Ziegler
                                      ---------------------
                                       Andrew A. Ziegler
                                       President


                                  ANDREW A. ZIEGLER

                                  /s/ Andrew A. Ziegler
                                  ---------------------


                                  CARLENE MURPHY ZIEGLER

                                  /s/ Carlene Murphy Ziegler
                                  --------------------------