Hurlbut, Cornelius S., Jr. Department of Geological Sciences, Harvard University, Cambridge, Massachusetts.
Wyllie, Peter J. Department of Geophysical Sciences, University of Chicago, Chicago, Illinois.
Last reviewed:January 2020
- Spinel transition
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A name given to a group of magnesium-iron silicate minerals crystallizing in the orthorhombic system. Crystals are usually of simple habit, a combination of the dipyramid with prisms and pinacoids. The luster is vitreous and the color olive green, giving rise to the name olivine (see illustration). Hardness is 6½–7 on Mohs scale; specific gravity is 3.27–3.39, increasing with increase in iron content.
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