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This glassy, opaque item was deep inside a eucalyptus blank. There was no indication from the outside of the wood that there was anything inside, so it must have been grown over while the tree was alive.closeup

It appears to be connected to / part of a small branch that was trapped inside; does anyone have any idea what it might be? It didn't chip like glass, and was only slightly harder than the surrounding wood.wider shot before removing the material

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    Looks like sap/resin that trees produce when they are damaged (e.g. by grown in branches)
    – Kromster
    Commented Nov 11, 2019 at 4:38
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    Yup, sap. Smaller bark and sap/resin inclusions aren't rare, although they occur more commonly in some species than others.
    – Graphus
    Commented Nov 11, 2019 at 8:00
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    @Graphus anyone can change his/her display name on SO. Open your profile (link on top-right) -> "Edit profile and settings" tab -> "Display name". Your SE name stays the same iirc, but it's never displayed afaik.
    – Kromster
    Commented Nov 11, 2019 at 8:08
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    @GraphussupportsMonica nice to see you support of Monica situation too!
    – Kromster
    Commented Nov 12, 2019 at 8:10
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    @KromstersayssupportMonica, honestly I can't imagine any reasonable person wouldn't!
    – Graphus
    Commented Nov 13, 2019 at 8:45

1 Answer 1

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Looks like sap/resin that trees produce when they are damaged (e.g. by grown-in branches). It indeed hardens over time and can be trapped within the growing tree.

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  • Thanks! Googling around a bit more, I think it is "kino" (en.wikipedia.org/wiki/Kino_(botany) ) - I was surprised that it could harden into such a glassy form...
    – AKA
    Commented Nov 11, 2019 at 16:13
  • It's quite akin to amber btw
    – Kromster
    Commented Nov 11, 2019 at 17:41
  • Akin to the starting point of amber. Amber is fossilised.
    – Graphus
    Commented Nov 12, 2019 at 7:24

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