362 Minerals. 



1821. 



Hatchettite from Merthyr Tydvil, S. Wales : presented by 

 Mr. Charles Hatchett, F.R.S. 



1822. 



Silver in calcite, from Chili : presented by Mr. Alexander 

 Caldcleugh. 



Two polished slabs of jadeite from China : presented by 

 Sir Abraham Hume, Bart. 



1823. 



Aragonite from Buckfastleigh, Devonshire : presented by 

 Prof. William Buckland, F.R.S. 



A large collection of Vesuvian products, upwards of 2000 in 

 number, brought together by Dr. Teodoro Monticelli [1759-1846], 

 for many years Professor of Chemistry at Naples, was purchased 

 in 1823; the results of the study of these products are given in 

 Monticelli and Covelli's Prodromo della Mineralogia Vesuviana, 

 1825. A manuscript list of the specimens of the collection, in 

 the handwriting of Prof. N. Covelli, is preserved in the Depart- 

 ment. Many of the best specimens of crystallised Vesuvian 

 minerals now in the Museum came as part of the Monticelli 

 collection. 



1824. 



Gold with aikinite, in quartz, from Beresovsk, Urals : presented 

 by Mr. J. M. Raikes. 



1825. 



Brilliant, greenish-yellow crystals of pyromorphite on the 

 matrix, from Wheal Alfred, Cornwall : presented by Mr. J. 

 Taylor, F.R.S. 



A series of cut and polished precious and other ornamental 

 stones, in which class of material the Museum Collection was 

 then very deficient, was purchased from Mr. H. C. G. von Struve 

 [1772-1851], at the time when he was Russian Minister-Resident 

 at Hamburg. The specimens, which numbered about 300, in- 

 cluded two large star-sapphires, weighing 88 and 30 carats 

 (nearly 18 and 6 grams) respectively, and also specimens of ruby, 

 topaz, hyacinth, chrysolite, chrysoprase, cat's-eye, precious opal, 

 carnelian, chalcedony, onyx, amethyst, rock-crystal with mineral 

 enclosures, and amber. 



