Pyroxenite banding at the boundary of a peridotite intrusion in the Western Gneiss Region, Otrøy, Møre og Romsdal, Norway. The peridotite is seen above (mocca-colouring from weathered olivine; some purple garnets), followed by a clinopyroxenite band (greenish Cr-diopsite) and orthopyroxenite (dark olive). Red minerals are garnet. Coin of 1 euro for scale.
Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
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{{Information |Description=Pyroxenite banding at the boundary of a peridotite intrusion in the Western Gneiss Region, Otrøy, Møre og Romsdal, Norway. The peridotite is seen above (mocca-colouring from weathered olivine; some purple garnets), followed by