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I did a project on glass fracture. I have wrote to you before and I was told about conchoidal fracture (the way glass fractures). You described it as circular and/or spiral shaped. I personally have never seen glass break this way. The results in my tests do not show this type of breakage, either. Do you know why? Can you give me some answers?
Question Date: 2004-03-15
Answer 1:

I may be there but because glass is usually thin plates it may not be obvious. I have attached a picture of obsidian (a volcanic rock that is basically fused pieces of glass) that shows what conchoidal fractures look like. If you try the glass again, maybe use a magnifying glass to look closely, I bet you will see the fracture.

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