Polarized Light Microscopy Digital Image Gallery
Shonkinite
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In addition to orthoclase and augite, shonkinite may contain a number of other minerals as well, including biotite, olivine, and nepheline. The rock does not, however, ever contain quartz and may only contain minor amounts of plagioclase feldspar. Shonkinite is closely related to several other relatively rare types of rock, such as theralite, essexite, and teschenite. |
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