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Crystallization and Order of Minerals

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The size of crystals in igneous rocks is generally a function of the rate of cooling. However, within the same rock crystal size does not necessarily reflect the order of crystallization for individual minerals. Without using Bowen's Reaction Series, how might you determine the order of crystallization of minerals in an individual rock sample? (Hint: Think about the texture).

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This solution explains how might you determine the order of the crystallization of minerals in an individual rock sample, without using Bowen's Reaction Series. Supplemented with one supporting resource.

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Please see attached response (also below), including one supporting resource. I hope this helps and take care.

RESPONSE:

Your tentative outline might look something to the effect...

I. Introduction (about ¼ page introducing your topic, including a purpose statement: The purpose of this paper is to discuss igneous rocks in terms of the size and order of crystallization using texture versus Bowen's Reaction Series.)E.g. The size of crystals in igneous rocks is generally a function of the rate of cooling. However, within the same rock crystal size does not necessarily reflect the order of crystallization for individual minerals. The purpose of this paper is to...

II. Texture (about ¾ page; include a brief description of the term and then explain how it is used to determine the order of crystallization of minerals in an individual rock in relation to Bowen's Series).

III. Conclusion (2 or 3 sentences; sum up main points).

Now let's look at some information to help you fill in the above outline.

1. The size of crystals in igneous rocks is generally a function of the rate of cooling. However, within the same rock crystal size does not necessarily reflect the order of crystallization for individual minerals. Without using Bowen's Reaction Series, how might you determine the order of crystallization of minerals in an individual rock sample? (Hint: Think about the texture).

The size of crystals in igneous rocks is generally a function of the rate of cooling. However, within the same rock crystal size does not necessarily reflect the order of crystallization for individual minerals. The purpose of this paper is to discuss...
Rock classification, for example, is the last step in identification and gives the rock its geological name. We classify rocks on the basis of mineralogy and texture. Texture, to a geologist, is how the minerals fit together; are they interlocking like the parts of a jigsaw puzzle or are they touching like billiard balls in a rack or pills in a bottle? Texture reflects the mineral content and the order of crystallization for individual minerals. But texture, to non-geologists, can also mean smooth like glass, softly textured like unfinished wood, or rough like sandpaper. If it is a ...

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