. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. OCCURRENCE IN THE URALS 321 BERYL (AQUAMARINE) The finest bervl to be found in tlio Urals occurs in the neighbourhood of Mursinka. It is usually in transparent, well-developed hexagonal prisms, which may be wine-yellow, greenish-yellow, yellowish-green, bluish-green, or pale blue in colour, and which range m ilength from a few millimetres to three
. Precious stones, a popular account of their characters, occurrence and applications, with an introduction to their determination, for mineralogists, lapidaries, jewellers, etc. With an appendix on pearls and coral. Precious stones; Pearls; Corals. OCCURRENCE IN THE URALS 321 BERYL (AQUAMARINE) The finest bervl to be found in tlio Urals occurs in the neighbourhood of Mursinka. It is usually in transparent, well-developed hexagonal prisms, which may be wine-yellow, greenish-yellow, yellowish-green, bluish-green, or pale blue in colour, and which range m ilength from a few millimetres to three decimetres (1 foot). The crystals are, as a rule, single, but intergrowths are occasionally met with in which the crystals are arranged irregularly or in parallel position. A group of fine yellowish-green or asparagus-green crystals, perfectly transparent and grown together in parallel position, was found in 1828. The group, which measures 27 centimetres in length and 31-2 centimetres in circumference, is now in the collection of the Imperial Institute of Mines at ISt. Petersburg, and has been valued at 43,000 roubles (£6800). The cavities in the rock, to the walls of which the crystals are attached, are usually filled witli brown clay, and the presence of this substance is considered to indicate that beryl is to be found not far away. Asso- ciated with the beryl are quartz, felspar, mica, and black tourmaline, also topaz and amethyst, of which more will be said later. There are numerous pits or mines from which these variously coloured stones are won. For the most part the stones are worked in the gem-cutting establishments of Ekaterinburg. Formerly all the mines clustered round the village of Mursinka, but later other mines were opened in the neighbourhood of the villages of Alabaslika, Sisikova, Yushakova, Sarapulskaya, and others, the population of which consists almost exclusively of gem- seekers. The beryls of Shaitanka were known as far back as the year 1815; they are a
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