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