| http://www.w3.org/ns/prov#value | - Thus, for Sr, its common ore celestite (SrSO4) is adequate in some repository environments; however, in most, a ceramic material such as strontium feldspar (SrAl2 Si2 O8) or its partial solid solutions with ordinary calcium feldspar of the general formula Ca1-x Srx Al2 Si2 O8 where x is a number less than 1 and greater than 0 will suffice.
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