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Tracy Barnhart
71 followers -
Author, Entrepreneur, Geologist
Author, Entrepreneur, Geologist

71 followers
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People believe that the Vikings used the light-polarizing property of Iceland Spar Calcite to tell the direction of the sun on cloudy days. books2read.com/ViktorsIce #FunBookFacts #CrystalCaveAdventures #ViktorsIce #MGlit
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Some people think that the "sunstone" mentioned in medieval Icelandic texts was actually Iceland Spar Calcite. books2read.com/ViktorsIce #FunBookFacts #CrystalCaveAdventures #ViktorsIce #MGlit
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Iceland Spar Calcite is a clear variety of the mineral that is known for double refraction. Hold a piece over an image and it appears doubled through the crystal.
http://books2read.com/ViktorsIce #FunBookFacts #CrystalCaveAdventures #ViktorsIce #MGlit
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Vikings perfected the longship in the 9th century, which were constructed using the "clinker-built" method where wood boards overlapped on the edges.
books2read.com/ViktorsIce #FunBookFacts #CrystalCaveAdventures #ViktorsIce #MGlit
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The prequel novella to the Crystal Cave Adventures series is out now and its FREE! http://tracybarnhart.com/join-the-book-club/
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Parents! Viktor's Ice, the prequel novella to the Crystal Cave Adventures series is now available for FREE. Join my book club and get a free eBook copy. You can download a version for any eReader or a pdf. Find out how the magic begins today. http://tracybarnhart.com/join-the-book-club/
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I'm excited that Blue John's Cavern, Book #1 in the Crystal Cave Adventures series is now in audio! Narrated by the awesome Caroline Turner Cole! Hear a preview at: amzn.to/2hHsZYU
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“May the Quartz be with you!” #geologyhumor #geologyjokes
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"I worked on an exploration team for 6 months and all I got was this lousy chert!" #geologyhumor #geologyjokes
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Arr, it's a pyrite's life for me! #geologyhumor #geologyjokes
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