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Dark inclusions of aegerine in light-green apatite Sketch showing different shapes of inclusions. 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]
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]
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 ...
The timing of mineral crystallization can be used to categorize diamond inclusions into three types: protogenetic, syngenetic, and epigenetic inclusions. [14] Minerals in the protogenetic inclusions were crystallized earlier than the diamond formation. The host diamond encapsulated pre-existing minerals during its crystallization.
They are usually dark in color, owing to the abundance of ferro-magnesian silicates, of high specific gravity and liable to decomposition. For these reasons they have been defined as a melanocrate series (rich in the dark minerals ); and they are often accompanied by a complementary leucocrate series (rich in the white minerals feldspar and ...
Shandite is commonly found as an inclusion in other minerals such as Heazelwoodite Ni 3 S 2 or serpentine. Its crystal system is trigonal hexagonal scalenohedral with symbol 3 2/m. It belongs to the space group R 3 m. Shandite is an anisotropic mineral, which means it has different properties when being viewed from different directions.
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When the mineral is rotated on the microscope stage its color does not change, indicating that it is non-pleochroic. Under crossed polar light, skaergaardite appears completely dark no matter the direction the stage is rotated, indicating that the mineral is isotropic. As skaergaardite is isotropic, it is also non-birefringent. [3] [5]