Light micrograph of a sample of basalt from the Ulten Valley, South Tyrol, Italy. Basalt is formed when the earth's mantle melts. The thin, low-silica magma cools relatively quickly when released to the Earth's surface or ocean. The magma usually contains inclusions (xenocryst) of minerals or entire rocks (xenolite) with a higher melting point, which were carried along during the ascent. Basalt consists mainly of a mixture of iron and magnesium silicates with pyroxene and calcium-rich feldspar (plagioclase) and also olivine. Magnification: x30 when printed at 15 centimetres wide.
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Creative#:
TOP27778619
Source:
達志影像
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RM
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