CONTENTS

PART I
OCCURRENCE OF THE RARE EARTHS
CHAPTERPAGE
I.The Nature of the Minerals and their Mode of Occurrence[1]
II.The Silicates[30]
(a)Silicates of Yttrium and Cerium Metals—Cerite; Gadolinite, Glowing of Minerals; Allanite, Hellandite,Thalénite and Thortveitite; etc.
(b)Silicates of Thorium and Zirconium—Thorite, Zircon, Naegite; etc.
(c)Mixed Silicates—Eudialyte, Beckelite; etc.
III.The Titano-silicates and Titanates[52]
(a)Titano-silicates—Yttrotitanite, Titanite; etc.
(b)Titanates—Yttrocrasite, Delorenzite, Ilmenite; etc.
IV.The Tantalo-Columbates[60]
(a)Containing no Titanium Dioxide—Samarskite (Annerödite), Plumboniobite, Yttrotantalite, Fergusonite,Sipylite; etc.
(b)Containing Titanium Dioxide—Æschynite; the isodimorphous series Euxenite, Polycrase, Blomstrandine,Priorite; Risörite, Wiikite; etc.
V.The Oxides and Carbonates[72]
(a)Oxides—Uraninite, Thorianite, Baddeleyite; Rutile, Anatase and Brookite; etc.
(b)Carbonates—Lanthanite; Parisite (Synchisite), Cordylite; etc.
VI.The Phosphates and Halides[82]
(a)Phosphates—Monazite, Xenotime (Hussakite); etc.
(b)Halides—Yttrocerite, Yttrofluorite; etc.
VII.The Monazite Sands[90]
VIII.Radioactivity of the Minerals[99]
PART II
THE CHEMISTRY OF THE ELEMENTS
IX.General Properties of the Cerium and Yttrium Groups[111]
X.General Methods of Separation[142]
XI.The Cerium Group—Cerium[156]
XII.The Cerium Group (continued)—Lanthanum, Praseodymium, Neodymium, andSamarium[168]
XIII.The Terbium Group[184]
XIV.The Erbium and Ytterbium Groups—Yttrium and Scandium[194]
XV.The Group IVa Elements—Titanium[219]
XVI.The Group IVa Elements (continued)—Zirconium and Thorium[238]
PART III
THE TECHNOLOGY OF THE ELEMENTS
XVII.The Incandescent Mantle Industry—Historical and General Introduction[265]
XVIII.The Chemical Treatment of Monazite[275]
XIX.The Manufacture of Mantles from Cotton and Ramie[291]
XX.Artificial Silk—its Production and Use in the Mantle Industry[301]
XXI.Other Technological Uses of the Cerium and Yttrium Elements, Zirconium andThorium[313]
XXII.The Industrial Applications of Titanium and its Compounds[325]
Index[342]