An JSolian Deposit at Clevedon. 869 



magnetites, aad many of the garnets are idiomorphic. Most of the 

 rutile is hypidiomorphic, and geniculate or kite-shaped twins are 

 rare. 



Contribution hy Mr. V. A. Eijles, B.Sc. — Unfortunately, the 

 analyser of my microscope was at that time suffering from a shock 

 received on the railway, besides which I was then obliged to obtain 

 the heavy residues by mere washing with water. These 

 disadvantages, however, have since been made up, for Mr. Eyles, 

 not long before leaving the University of Bristol for the Geological 

 Survey of Scotland, made an examination of the sands with 

 proper appliances, and has kindly communicated his results. 



He identified all the above-named minerals, except ilmenite, 

 epidote, hornblende, and monazite. His confirmation of the 

 presence of andalusite (whereof, with my crippled microscope, 

 I- had been doubtful) is very important. He found, in addition, 

 kyanite, magnetite, haematite, orthoclase, and a little triclinic 

 felspar, some of which is microcline, some apparently albite, some 

 apparently more basic. Dr. H. H. Thomas also identified in 

 his slides a little anatase and brookite. The ruddy colouring matter 

 he regards as limonite, and found also a little cementing calcite. 



Most of the tourmaline is greenish-brown, but a little is blue, 

 while a pink variety seems to be present. He notes that there are 

 two varieties of rose-coloured garnet, one worn and of moderate 

 size, the other small and idiomorphic. 



He also made (from one sample) the following quantitative 

 estimation of the proportions of the constituent minerals : — 



In-sol.in HCl. ] Minerals, Sp.G. < 2-8 



I Heavy Minerals, Sp.G. > 2-8 

 ] Minerals, Sn ft .r">-S 

 I Fine Mud 

 r Calcite (chiefly) 

 Sol. in HCl. - Oxide of Iron (coating grains) and other un 

 [ determined soluble matter 



0-64 



80-26 



3-00 



8-50 



7-60 



100-00 



Percentage of Heavy Minerals in the grains freed from calcite 



and iron oxide ....... 0-79 



The minerals present, besides quartz, calcite, and limonite, are 

 therefore — ■ 



Plentiful. Zircon, Tourmaline, Garnet, Magnetite, Rutile. 



Moderate Quantity. Staurolite, Orthoclase. 



Small Quantity. Andalusite, Biotite, White Mica, Hornblende, 



Epidote, Kyanite, Hematite, Ilmenite. 

 Very Rare. Anatase, Brookite, Monazite (?), Albite (?), 



Basic Felspar (?), Microchne. 



The Loams, which are but feebly plastic, are mainly composed of 

 minute angular quartz and a flocculent matter which appears to be 

 limonite. They are calcareous, efl'ervescing slightly with hydro- 

 chloric acid, and shell-flakes are common. The loamy component 

 of the sands appears to be of the same general character. 

 VOL. Lix. — NO. vni. 24 



