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The old mineral name uralite is at times applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite. The metamorphosed gabbro or diabase rock bodies, referred to as epidiorite , contain a considerable amount of this uralitic alteration.
Many scholars theorize that the phenomenon known as, Skin bleaching, is a product of the preference for lighter skin in communities of color. [36] [37] Some studies show that because, since slavery lighter skin has been treated more favorably than dark skin in colonized communities, people of color have been motivated to bleach their skin. [36]
Stones treated from the side will have one half colored deeper than the other. Cyclotron treatment is now uncommon. Gamma ray treatment is also uncommon, because although it is the safest and cheapest irradiation method, successful treatment can take several months. The color produced is a blue to blue-green which penetrates the whole stone.
Discrimination based on skin tone, also known as colorism or shadeism, is a form of prejudice and discrimination in which people of certain ethnic groups, or people who are perceived as belonging to a different-skinned racial group, are treated differently based on their different skin tone.
Diamond crystals in a diamond can also be present in the form of long and thin needles. These may not be visible to the naked eye, unless the needle inclusion is of a noticeable color or has a noticeable presence. Some needle inclusions are also known to give diamonds a special look.
The most common mineral inclusion in peridot is the chromium-rich mineral chromite. Magnesium-rich minerals also can exist in the form of pyrope and magnesiochromite. These two types of mineral inclusions are typically surrounded "lily-pad" cleavages. Biotite flakes appear flat, brown, translucent, and tabular. [16]
The College Football Playoff selection committee enters its final two weeks of deliberation with a host of consequential decisions thrust on the 13 members.
Mineral inclusions, especially the silicate inclusions in lithospheric diamonds, can be classified into two dominant types depending on the mantle parental rocks of the host diamond: eclogite (E-type) and peridotite (P-type). These are the two main parental rocks for the diamond formation which mostly lead to silicate inclusions.