These two photos are of the same crystal of fluorite under different light sources.
It was found at the Flamboro Quarry, near Dundas, Ontario
It is no longer in our collection, but I believe it was about 4 cm on the longest dimension.
Inclusions of hydrocarbon lend the golden brown colour to the daytime shot.
They are also responsible for the glow-in-the dark effect under long wave ultra violet light.
And since I couldn’t get this funny bird’s “daytime / night-time” voice out of my head
I thought I’d share the joy.
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Inspired by Jennifer Nichole Wells One Word Photo Challenge