Abstract
AMETHYST (a well-known variety of quartz) has a rich violet colour, the origin of which has been discussed by several workers. Tutton1 states that the twinning of right-handed and left-handed quartz may be the probable cause. Holden2 has suggested that an impurity like iron oxide imparts the colour. An inorganic dye, the physical state of aggregation of which changes on heating, has also been mentioned as another possibility. It was felt that a magnetic study of quartz and amethyst may throw some light on this problem.
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References
Tutton, “Crystallography and Practical Crystal Measurement”, 509 (1922).
Holden, Ann. Min., 10, 203 (1925).
Mellor, “Treatise on Chemistry”, 6, 138 (1925).
Krishnan and Banerjee, Phil. Trans. Roy. Soc., A, 234, 267 (1935).
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LEELA, M. Magnetic Study of Amethyst. Nature 172, 464 (1953). https://doi.org/10.1038/172464a0
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DOI: https://doi.org/10.1038/172464a0
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