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EXHIBIT 99.6: FORM OF LETTER TO CLIENTS OF NOMINEE HOLDERS


To Our Clients:

     We are sending this letter to you because we hold shares of United States
Lime & Minerals, Inc. common stock for you. United States Lime & Minerals has
commenced an offering of subscription rights to purchase its common stock, as
described in the enclosed Prospectus.

     We have enclosed your copy of the following documents:

          1. A Letter to Shareholders from the Company;

          2. The Prospectus; and

          3. The Beneficial Owner Election Form.


     We urge you to read these documents carefully before instructing us to
exercise your subscription rights. We will act on your behalf according to your
instructions. We will not exercise your subscription rights unless you instruct
us to do so.