FIELD: technological processes.
SUBSTANCE: invention relates to enrichment of non-metallic minerals and physical-chemical treatment of jewellery stones, particularly garnets, preferably, chromium-containing andradites, and can be used in jewellery industry. Method of thermal treatment of mineral includes heat treatment of mineral to change colour of said mineral. Heat treatment is carried out at temperature, °C: 700÷900 during, min: 20÷120 in reducing atmosphere. Mineral refers to a group of garnets.
EFFECT: technical result is improved colour characteristics of low-quality demantoid.
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