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(I'm not a geologist, just helping my kids collect rocks).

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It is confusing - both rocks are commonly pink overall. But, granite has abundant quartz, syenite has no quartz to very little. Quartz will be the grey translucent mineral that looks just like a blob with no distinct shape.

You can use this website: https://www.virtualmicroscope.org to see examples of syenite and granite (use the search box).

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