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Baris 13:
* {{en}} [https://goby.nrl.navy.mil/branch/UFFC_Archive/cd01/fc/proceed/1959/proceed/s5910462.pdf PDF of Charles Sawyer's cultured quartz process description]
* {{en}} [http://geology.com/articles/herkimer-diamonds.shtml Herkimer Diamonds: Quartz Crystals]
[[Kategori:Mineral]]
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