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Nickel-Strunz Classification - Heptaborates and other megaborates 10th edition

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6.GA	Tekto-heptaborates
6.GB	Phyllo-nonborates, etc.
6.GC	Tekto-dodecaborates
6.GD	Mega-tektoborates

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Current server date and time: 23rd May 2013 13:10:03