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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1 Best Answer
Fusibility as the term itself explains about the conversion from solid to liquid form under some amount of heat compatible with the given mineral. In short, fusibility comes from fuse (that means melt), so it usually explains the melting of a given specimen when some amount of heating or temperature is increased. Von Kobbels fusibility scale is not that much pronounced when it comes to geology as it consists of only 6 minerals specifically (some melts or fuse at lower temperatures while some of them needs higher temperatures). Minerals included in this scale are-- Stibnite, Natrolite, Almandine, Actinolite, Orthoclase and Bronzite in the order of increasing temperatures of fusion. You can clearly notice how Von cleverly put various mineral groups in his chart to explain about the fusion temperatures. Note: This scale is not given in JAM syllabus and in GATE syllabus as well, so It's not important for both exams as I mentioned above. So no need to get trapped by these. Though you can relate the fusion temperatures of these six minerals with their physical attribute, but this scale is not an only option for the same.