CONTENTS. 



Page 

 I. — Introduction. — Limitation of mica resources. Meaning of its 



names. Ancient views of its origin, nature, and use . . .11 



II. — Mineralogical and Chemical Characters. — Classification of 

 the micas. Crystalline form. Artificial and natural percussion 

 and pressure figures. Twinning. Optical characters. Asterism. 

 Inclusions. Intergrowths. Hardness. Chemical composition 

 and constitution of the groups and varieties. Artificial mica . 16 



I II. — Geological Occurrence.— Pegmatites. Mineral composition and 

 origin. Contemporaneous veins. Aquo-igneous magmas. Form 

 of pegmatite-masses. Contact effect on the surrounding rocks. 

 " Country," favourable and unfavourable to good mica . . 30 



IV. — Geographical Distribution. — Restricted in India. General 

 characters and prospects of the Bengal mica field. The " dome 

 gneiss " and associated schists. Accessory minerals. Mylonitic 

 bands. Sikkim-Tibet. Chhota Udepur. Nirukot. Rewah. 

 Bastar. Bilaspur. Balaghat. Coorg. Coimbatore. Ganjam. 

 Nellore. Nilgiris. Salem. Vizagapatam and minor occurrences 

 in Madras. Mysore. Gurgion. Babeh. Kulu. Ajmere- 

 Merwara. Jaipur. Kishengarh. Tonk. Sirohi . . -43 



V. — Uses of Mica. — Window-panes. Lanterns. Fire-screens. Lamp- 

 chimneys. Envelopes. Electrical uses. Micanite. Anemome- 

 ters. Bent mirrors. Optical uses. Scrap-mica. Packings and 

 covers. Lubricant. Dynamite. Ornamental uses. Fire-bricks. 

 Medicinal use . . • 73 



VI.— Mining Practice. — Underground work in Bengal. Quarry-work in 

 Madras. Want of system in underground management and 

 surface transport. Systematic operations at Bendi. Dressing. 

 Quality. Grades. Prices. Labour. Production and Trade. 

 Prospecting and mining rules ....... 73 



VII.— Published Literature. 



VIII. — Isdex to Localities. 



IX. — General Index. 



X.— Plates. 



