Syenite: R1814
Item
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Title
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Syenite: R1814
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Description
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This sample of syenite (var. alkalic syenite) has a phaneritic texture. In hand sample, visible minerals include quartz and Na-rich plagioclase, in roughly equal quantities. Identifying characters include the phaneritic texture and light gray color. In thin section, the quartz and feldspar crystals are intergrown in a matrix, with additional muscovite crystals contributing about 5% by volume. Additional lath-shaped megacrysts are also present, contributing roughly 10% by volume. The crystals show signs of dissolution.
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Creator
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5052
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Type
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igneous rock
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Mediator
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Tamara Carley
