CONTENTS. 
Chapter V. — concluded. 
Extinction angles .... 
Double refraction .... 
Separation of the mineral 
Specific gravity .... 
Chemical composition 
Juddite ...... 
Chapter VI. — Silicates {coniinwid) — Garnets. 
Manganese-garnets .... 
Characters of garnets 
Composition of garnets . 
Isomorphous replacement 
Origin of the term ' spandite ' . 
Use 0 f the term ' spessartite ' . 
Origin of the term ' grandite ' . 
Analyses of Indian manganese-garnets 
Spessartite ...... 
Occurrence ..... 
Abundance and economic importance 
Localities for good crystals 
Crj'stallographic characters 
Cleavage ..... 
Structure zoning .... 
Striations ..... 
Specific gravity .... 
Colour ...... 
Colour zoning .... 
Inclusions ..... 
Anomalous double refraction . 
Microscopic aspect 
Spandite ...... 
Chemical composition 
Occurrence . . . . 
Characters ..... 
Grandite ...... 
Aplome ...... 
Calderite ...... 
Occurrence ..... 
Chemical composition 
Chapter VII.— Silicates (co?iciMrferf)— Epidotes, Micas, etc. 
Piedmontite ..... 
Characters ..... 
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