You are currently viewing Images of Yooperlites from Pebble beach, Marathon, Ontario

Images of Yooperlites from Pebble beach, Marathon, Ontario

Yooperlites from Pebble beach, Marathon, Ontario

Yooperlites are an uncommon fine to coarse-grained gray igneous rock named syenite. It is composed mainly of alkali feldspar and ferromagnesian minerals such as hornblende.  Yooperlites are very ordinary looking igneous in normal but when exposed to long wave ultraviolet light has a fluorescent mineral is variety of sodalite, which glows orange.


           (Updated) A nicer photo with truer color.  Used my trusty 40 year old Raytech UV light.

This Post Has 2 Comments

  1. Doug Bank

    The real name for these rocks is Yooperlite, though I have found some in Illinois and called them Looperlites (after the Chicago Loop). In any event, you should get a better UV light (for example, a Convoy S2+ UV 365) because there is way way too much blue in your images. https://www.facebook.com/photo.php?fbid=10155847984910318

  2. Gary Kindel

    Thanks for spotting the spelling error. My cheap long wave UV flashlights from wish.com is only partially to blame for bluish tint to the images. My iphone 8 camera didn't handle the UV photos well it added some of the excess blue to the images

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