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Opal Inside | Exterior My Window


Widespread hackberry fruit (by Kate St. John) and valuable opal (from Wikimedia Commons)

27 November 2024

November is an efficient time of 12 months to search for hackberry timber in Pittsburgh and look at their fallen fruit. By now the pulp has worn off the pits, however not like wood cherry pits hackberries’ are like white seashells with a microscopic lattice of opal inside.

Widespread hackberry pits: one entire, one opened (photograph by Kate St. John)

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Then go discover a hackberry tree (and an electron microscope).

Hackberry bark and naked branches make it simple to establish the tree, even in winter. The bark has ridges and the ridges have development traces.

Hackberry bark has ridges. The ridges have development traces (photograph by Kate St. John)

Up within the naked branches, hackberry timber generally have twig formations referred to as witches brooms “produced by the consequences of an eriophyid mite (Aceria celtis) and/or an related powdery mildew producing fungus (Sphaerotheca phytoptophila)” — from bugwood.

Witches brooms on hackberry by Whitney Cranshaw, Colorado State College from Bugwood.org

Discovering an electron microscope to view the opal is a a lot tougher activity.

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