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Dumortierite

The Silicate Minerals

Dumortierite is a borosilicate with the formula Al₂₇B₄Si₁₂O₆₉(OH)₃. It's typically blue or violet and found in fibrous masses in gneiss or schist.

Hydrous aluminum borosilicate

Photo courtesy Quatrostein via Wikimedia Commons

Other Metamorphic Minerals

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Gallery Index: The Silicate Minerals

Mineral Basics

Mineral Pictures A to Z The Rock-Forming Minerals Mineral Identification Guides

Details of the Silicates

The Pyroxene Minerals The Mica Minerals Quartz and Silica Minerals Gallery

More Silicates

Amphibole Minerals The Garnet Minerals Zeolites

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Andrew Alden

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