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Size topview insideview clear light

This rock is red/orange/brown in color.
It is slightly clear/translucent when held up to light.
Will not scratch with a knife.
Has a crystal like structure on the inside.

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  • $\begingroup$ Where did you find it? $\endgroup$ – L.B. Mar 8 at 15:03
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The red bit is chert, one of the most common rock types there are. I'm not sure what the white interior is, but I suspect it could be calcite. This could be a recrystallised limestone-hosted chert nodule.

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    $\begingroup$ Or the white could be crystalline quartz. If it is calcite a knife will scratch it. If quartz a knife will not. Chert is a form of quartz, too. $\endgroup$ – haresfur Jan 30 at 1:25

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