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silico-magnesian
silico-magnesian adj. 
/ˌsɪlᵻkə(ʊ)maɡˈniːzɪən/, /ˌsɪlᵻkə(ʊ)maɡˈniːʃn/, /ˌsɪləkoʊˌmæɡˈniʃ(ə)n/
Brit. /ˌsɪlᵻkə(ʊ)maɡˈniːʒn/
, /ˌsɪlᵻkə(ʊ)maɡˈniːʒn//ˌsɪlᵻkə(ʊ)maɡˈniːzɪən//ˌsɪlᵻkə(ʊ)maɡˈniːʃn/U.S. /ˌsɪləkoʊˌmæɡˈniʒ(ə)n/
, /ˌsɪləkoʊˌmæɡˈniʒ(ə)n//ˌsɪləkoʊˌmæɡˈniʃ(ə)n/ΚΠ
1842 J. B. Fraser Mesopot. & Assyria xv. 344 Gray or blueish sandstone, containing red nodules of a silico-magnesian substance.
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