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How large is the biggest known tridymite crystal? And how large is the average tridymite crystal?

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Most images of tridymite that I've seen do not have a scale in the image.   How large is the average tridymite crystal? How large is the biggest known tridymite crystal?  Thanks.
asked Jun 14, 2016 by petercha (120 points)

1 Answer

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Tridymite is usually small forming in cavities of volcanic rock. It is SiO2. Same as Quartz. It is a form which has a unique 

Way of forming the crystals which make it different from Quartz. For more information read the link.

http://www.minerals.net/mineral/tridymite.aspx

answered Jun 14, 2016 by Weasel (38,360 points)
 


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