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Moonstone is a sodium potassium aluminium silicate ((Na,K)AlSi 3 O 8) of the feldspar group that displays a pearly and opalescent schiller. [ 1 ] [ 2 ] An alternative name for moonstone is hecatolite [ 2 ] (from goddess Hecate ).
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It was first described by Ermenegildo Pini in 1781. [6] The optical effect of adularescence in moonstone is typically due to adularia. [7] The largest documented single crystal of orthoclase was found in the Ural Mountains in Russia. It measured around 10 m × 10 m × 0.4 m (33 ft × 33 ft × 1 ft) and weighed around 100 tonnes (110 short tons).
The 'I' of the I 1, and I 2 grades originally stood for "Imperfect". [2] During the 1970s, two changes were made to the system. Firstly, the Internally Flawless grade was added, as GIA noticed that many diamonds were being aggressively cut to remove any surface blemishes, and thereby reducing the cutting quality ("make") of the diamonds. [2]
Jewellery design is the art or profession of designing and creating jewellery. It is one of civilization's earliest forms of decoration , dating back at least 7,000 years to the oldest-known human societies in Indus Valley Civilization , Mesopotamia , and Egypt .
Easotope software archives, organizes, and analyzes mass spectrometer data. It is currently oriented toward clumped CO 2 analysis but is also useful for bulk CO 2 work and expandable to other isotopic systems. El-MAVEN Open-source Desktop software by Elucidata processes labeled LC-MS, GC-MS and LC-MS/MS data in open-formats (mzXML, mzML, CDF).
The quality model presented in the first part of the standard, ISO/IEC 9126-1, [2] classifies software quality in a structured set of characteristics and sub-characteristics as follows: Functionality - "A set of attributes that bear on the existence of a set of functions and their specified properties. The functions are those that satisfy ...
It streaks white, [6] and its Mohs hardness varies between 3.5 and 4.5. Its specific gravity is between 3.45 and 3.6. [7] The crystal system of rhodochrosite is trigonal, with a structure and cleavage in the carbonate rhombohedral system. The carbonate ions (CO 2−