Differences between quartzite and segregation quartz

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Differences between quartzite and segregation quartz

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prcantos
Site Admin

Joined: 17 Apr 2012
Posts: 243
Location: Granada (Spain)

Posted: Aug 23, 2012 05:50 Post subject: Differences between quartzite and segregation quartz

Hi. Recently I have collected some quartzite rock specimen, but I wonder if they are real quartzite or just segregation quartz clasts. Do you know some differences between them? The following pictures include some observations I think may be useful. Cany you add another criteria, or correct mine if necessary? After your opinions I will put the right specimens in FMF Guide of Metamorphic Rocks. Thanks.

754 001.jpg

Description:

Quartzite?
Sierra de Baza (Granada, Spain)
In the center of the picture you can see nearly rounded grey dots. I suppose they are old sandstone grains now incorporated to the recrystallized rock. Segregation quartzs would not have these grains.

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7462 Time(s)

754 002.jpg

Description:

Quartzite?
Sierra de Baza (Granada, Spain)
Another example, the same remark.

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7395 Time(s)

754 003.jpg

Description:

Quartzite?
Sierra de Baza (Granada, Spain)
Segregation quartzs are not supposed to bear aligned mica or phyllosilicates because it was segregated and separated from them.

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7418 Time(s)

754.jpg

Description:

Quartzite?
Sierra de Baza (Granada, Spain)
9 cm. long
Ordered-by-size grains usually reveal a clastic-sedimentary origin. Segregation quartzs shouldn't show this configuration.

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7429 Time(s)

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