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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