Cleavage of Jewel
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What is Cleavage of Jewel
The word 'cleavage' originally referred to 'tearing and opening'. It has a characteristic that plane of a mineral burst open by cutting move the face of a plane with a blade like knives. Since the bonding strength between the atoms, ions and molecules of a direction perpendicular to a certain specific plane is weak, a crystal can have the character to be easily divided in directions parallel to the cleavage plane. Since there are six directions, adopting the right strategy makes it easier to process such a hard jewelry.
Six directions of cleavage
| One direction | Mica |
|---|---|
| Two directions | Amphibole |
| Two directions | Calcite |
| Four directions | Fluorite |
| Six directions | Sphalerite |
| No cleavage | Quartz |
Moreover, there are some crystals in which the cleavage breaks regularly, whereas in others it breaks irregularly. This is called a 'fracture'. The fracture happens if there is no cleavage or even if there’s cleavage that breaks in a different direction. Neither quartz nor Garnett have cleavage, and when divided forcibly, a cross section will have the shape of a shell or an irregular form. Besides, it can assume a variety of shapes like earthy, needle-like, flat-shape and so forth.
Diamond cleavage (octahedron)
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Space Delivery Project: Return to Earth
Initial shipment launched
Scheduled to return to Earth
after 6 months of exposure to outer space -
History of Orbray crystal glass [Story of Watch 3]
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First round of Space Delivery Project “RETURN to EARTH” The ceremony celebrating the return of the payload items was held
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Summary of “Grinding” and “Polishing”A brief introduction to these processing technologies and how they are used.
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Method for mass production of 2-inch diamond wafers developed - Expected to spur industrialization of power-semiconductor devices
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Award: Industrial Standardization Enterprise Award
