Chapter II: Part I: Occurrence of the Rare Earths

CHAPTER PAGE

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, AND SAMARIUM 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