This page has a photo of what to look for! Though seems that collecting them is now banned at pt leo.
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http://www.mindat.org/gallery.php?loc=256117
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and here is a page about stones found in gembrook
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http://www.mindat.org/gallery.php?loc=219724
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http://www.mindat.org/gallery.php?loc=256117
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and here is a page about stones found in gembrook
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http://www.mindat.org/gallery.php?loc=219724