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Labradorite became popular with the
missionaries. Labradorite is a plagioclase feldspar which shows..
Labradorite became popular with the
missionaries. Labradorite is a plagioclase feldspar which shows..
Lapis usually forms in crystalline marble
through the geological process of contact..
Tourmaline varies in transparency and
colour to a considerable extent. Crystals of tourmaline may b..
Tourmaline varies in transparency and
colour to a considerable extent. Crystals of tourmaline may b..
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