What rock is magnesium found in?
igneous and metamorphic rocks
How would the color and density of rock composed mostly of non-ferro magnesium silicate minerals differ from one made up mostly of ferro-magnesium silicate?
No, the highest density rock is found in the oceanic crust. This is commonly enriched in higher density elements such as magnesium and iron (hence the rocks are described as Mafic) as opposed to the Felsic rocks of the continental crust which have higher proportions of the less dense elements such as silicon and oxygen.
Magnesium is the fourth most abundant mineral in the body and is essential to good health. Approximately 50% of total body magnesium is found in bone. The other half is found predominantly inside cells of body tissues and organs. Only 1% of magnesium is found in blood, but the body works very hard to keep blood levels of magnesium constant