crystallinity
geology
Learn about this topic in these articles:
igneous rocks
- In igneous rock: Crystallinity
Among the most fundamental properties of igneous rocks are crystallinity and granularity, two terms that closely reflect differences in magma composition and the differences between volcanic and various plutonic environments of formation. Crystallinity generally is described in terms of the four categories shown in…
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iron-rich sedimentary rock
- In sedimentary rock: Origin of banded iron formation
The essentially crystalline texture of these minerals together with the definitive crystalline texture of the laminated chert bands with which the iron mineral layers alternate is perplexing. At present, iron is not easily dissolved, nor can it be readily transported in solution and subsequently precipitated as crystalline-textured,…
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