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283. Dumortierite. Massive

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Dana number

54.1.2.1

Chemical formula

(Al,Fe³⁺)₇(BO₃)(SiO₄)₃O₃(anhydrous)

Crystal class

Orthorhombic

Mohs hardness

7 to 8

Specific gravity

3.25-3.41

Collected in

Oreana, Nevada, United States

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