borrowing with directional channel locking

Both the fibrous and traditional forms of sillimanite are common in metamorphosed sedimentary rocks. The first layer type is composed of garnet (slightly lower relief and isotropic) and coarse-grained sillimanite (slightly lower relief and medium birefringence colours). The remainder of the … Key optical features of Sillimanite in thin section: Colourless Needle-like shape, with diamond-shaped cross sections Moderate relief One cleavage parallel to length and typically fractured across length of needle Moderate order interference colours Straight extinction. A common variety of sillimanite is known as fibrolite, so named because the mineral appears like a bunch of fibres twisted together when viewed in thin section or even by the naked eye. In thin section the coarse-grained texture is dominated by two types of layer. Common minerals that might be confused with sillimanite and occur in similar rocks:

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