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Earth lab datasite

		Tourmaline Silicate schorl in granite
		silicate Na (Fe Mn)3 Al6 B3 Si6 O27 OH3 F?


*Scale bar = 1 centimetre*

		*cleavage*:	Very indistinct
		*crystal system*:	Trigonal
		*hardness*:	7.0 - 7.5
		*relative density*:	3.0 - 3.2

		Bovey Tracey, Devon

		25 K 5