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Petroglyphs have been discovered all over the populated world, notably in parts of Africa, Scandinavia, Siberia, southwestern North America, Northern and Western Australia, and the Iberian Peninsula.Some of these images have a special cultural and/or religious significance for the societies that created them.These archeological discoveries are always controversial and the scientific community is extremely selective in what they accept as fact.Every object on this list has been accused of being an elaborate hoax.The most important, but mysterious, type of petroglyph is the cupule - a non-functional cup-shaped hole created by percussion in the horizontal or vertical surface of a rock.

According to accounts, Julsrud stumbled upon the artifacts while riding his horse in the Acámbaro area.

They can help to identify your specimen and to learn something about their properties, but they don't get you anywhere beyond that. Silica Minerals John Wiley, New York and London, 1962 Jaroslav Hyrsl, Gerhard Niedermayr Magic World: Inclusions in Quartz / Geheimnisvolle Welt: Einschlüsse im Quarz Bode Verlag Gmb H, Haltern, 2003 ISBN 3-925094-81-4 L.

I strongly recommend to get and read textbooks on geology and mineralogy. Jung High Purity Natural Quartz Part I: High Purity Natural Quartz For Industrial Use Quartz Technology, Inc. ISBN 3-7225-6204-X Ichiro Sunagawa, Hideo Iwasaki, Fumiko Iwasaki Growth and Morphology of Quartz Crystals: Natural and Synthetic Terrapub, Tokyo, 2009 ISBN 978-4-88704-146-2 Christian Weise (editor) extra Lapis No. Dietrich Mineralogy - Concepts, Descriptions, Determinations W. Freeman and Co., San Francisco, 1983 ISBN 0-7167-1424-8 Harvey Blatt, Robert J. Owens Petrology - Igneous, Sedimentary, and Metamorphic W. Freeman and Co., New York, 2006 ISBN 0-7167-3743-4 Gregor Markl Minerale und Gesteine - Eigenschaften - Bildung - Entstehung Elsevier, Spektrum Akademischer Verlag, Heidelberg, 2004 ISBN 3-8274-1495-4 Martin Okrusch, Siegfried Matthes Mineralogie - Eine Einführung in die spezielle Mineralogie, Petrologie und Lagerstättenkunde.

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Many strange archaeological discoveries have been made in modern history.

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