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In short, melasma is a chronic skin condition that appears as darkened areas on the face due to an overproduction of melanin, says Gina Charles, MO, a family physician specializing in skincare. It ...
Brookite is a brittle mineral, with a subconchoidal to irregular fracture and poor cleavage in one direction parallel to the c crystal axis and traces of cleavage in a direction perpendicular to both the a and the b crystal axes. [1] [3] [4] Twinning is uncertain. [3] [4] The mineral has a Mohs hardness of 5 + 1 ⁄ 2 to 6, between apatite and ...
In mineralogy, an inclusion is any material trapped inside a mineral during its formation. In gemology, it is an object enclosed within a gemstone or reaching its surface from the interior. [1] According to James Hutton's law of inclusions, fragments included in a host rock are older than the host rock itself. [2] [3]
[1] [4] P-type and E-type inclusions can be distinguished based on the content of specific materials in the trapped mineral. For instance, in garnet inclusions, the content ratio of chromium(III) oxide (Cr 2 O 3) and calcium oxide (CaO) can be the basis for the classification. [5] E-type garnet inclusion contains less Cr 2 O 3 while P-type ...
Breyite is a high pressure calcium silicate mineral (CaSiO 3) found in diamond inclusions. [3] [4] It is the second most abundant inclusion after ferropericlase, for diamonds with a deep Earth origin. [5] [4] Its occurrence can also indicate the host diamond's super-deep origin. This mineral is named after German mineralogist, petrologist and ...
Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions.
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