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2 075 559

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C1

(51)

IPC

(21) (22)

Application

94018642/26, 1994-05-23

(22)

Actual filing date

1994-05-23

(45)

Published

1997-03-20

(72)

Inventor

Golenko V.P.Poljanskij E.V.Jarotskij V.G.

(73)

Holder

Vserossijskij Nauchno-Issledovatel'Skij Institut Sinteza Mineral'Nogo Syr'Ja

METHOD OF PREPARING COLORED BERYL CRYSTALS Russian patent published in 1997 - IPC

Abstract RU 2075559 C1

FIELD: jewelry art. SUBSTANCE: invention concerns preparation of colored beryl crystals for use in jewelry industry. For this purpose, a blend contains, %: beryl with magnesium and calcium fluorides, 52.5-65; aluminium fluoride, 3-10; and chromophor metal oxide, 0.5-2.0. It is melted and kept at 1220-1250 C for 12-24 h, whereupon temperature drop between dissolving zone of beryl at 1170-1250 C and crystal growth zone (growth velocity 1-3 C a day) at 950-1000 C is created. EFFECT: improved procedure. 1 tbl

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RU 2 075 559 C1

Authors

Golenko V.P.

Poljanskij E.V.

Jarotskij V.G.

Dates

1997-03-20—Published

1994-05-23—Filed

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