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isochemically
isochemically adv. 
/ˌaɪsəˈkɛmək(ə)li/ without a change in chemical composition.
Brit. /ˌʌɪsə(ʊ)ˈkɛmᵻkli/
, /ˌʌɪsə(ʊ)ˈkɛmᵻkli/U.S. /ˌaɪsoʊˈkɛmək(ə)li/
, /ˌaɪsoʊˈkɛmək(ə)li//ˌaɪsəˈkɛmək(ə)li/ΘΚΠ
the world > the earth > structure of the earth > constituent materials > rock > mineral or chemical composition > [adverb] > chemical composition
isochemically1964
1964 J. Challinor Dict. Geol. (ed. 2) 133/2 A rock changing its mineral composition iso~chemically remains a closed ‘system’.
1973 Nature 23 Mar. 243/2 The thickness of halite salt that could be precipitated isochemically from one basinful of Mediterranean waters..is..only about 20 m.
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