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Nuummite
Nuummite is an opaque metamorphic rock with an iridescent play of color. Its chief constituent minerals are gedrite and anthophyllite, along with pyrite, pyrrhotine and chalcopyrite. Nuumite has a hardness of 5.5 to 6 on the Mohs scale.

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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
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Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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