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Metal speciation in natural waters is of increasing interest and importance because toxicity, bioavailability, environmental mobility, biogeochemical behavior, and potential risk in general are strongly dependent on the chemical species of metals.etal speciation in natural waters is of increasing interest and importance because toxicity, bioavailability, environmental mobility, biogeochemical behavior, and potential risk in general are strongly dependent on the chemical species of metals.
Isosilicates. Olivine is a good example of the variability in the chemical composition of minerals. Olivine is a ferromagnesian silicate. In olivine, the ratio of iron to magnesium can vary from 0 to 1. In other words, some olivines might contain no iron, only magnesium.