GENERAL INDEX 



Acicular, 41. 



Adamantine luster, 43. 

 Amorphous, 6. 

 Antimonates, 117-22. 

 Antimonids, 51-61. 

 Arborescent, see Dendritic. 

 Arsenates, 117-22. 

 Arsenids, 51-61. 



Atomic weights, table of, 135-36. 



Axes, crystallographic, 10-11; inter- 

 changeable, 10; of symmetry, 

 7-10. 



Basal pinacoid, 22, 26, 32, 35. 



Biaxial crystals, 37. 



Binary symmetry, 8; axis of, 8. 



Bladed, 40. 



Borates, 122-23. 



Botryoidal, -±0. 



Brachy dome, 33. 



pinacoid, 32. 



prism, 32. 



pyramid, 33. 

 Brittle, 43. 

 Bromids, 63-66. 



Capillary, 41. 



Carbonates, 79-87. 

 Center of symmetry, 10. 

 Characters of minerals, 41-44. 

 Chemical composition of minerals, 



44-45. 

 Chlorids, 63-66. 

 Chromates, 124-27. 

 Cleavage, 41. 

 Clino dome, 35. 



pinacoid, 35. 



prism, 35. 



pyramid, 36. 

 Color, 44. 



Columbates, see Niobates. 

 Columnar, 40. 



Composition of minerals. 44-45. 



Coralloidal, 41. 



Crystal forms, 11. 



Crystal habit, 38. 



Crystalline aggregates, 40. 



Crystalline structure, 5. 



Crystals, definition of, 5; laws of, 

 6-10; optical characters of, 13, 25, 

 37; variations in form of, 38; 

 groupings of, 38-39; inclusions in, 

 40; irregularities of, 39; striations 

 on, 39; twinning of, 38-39. 



Crystallography, 5-41. 



Cube, 14. 



Curved surfaces of crystals, 39. 



Dendritic, 41. 



Dihexagonal pyramid, 26. 



prism, 26. 

 Dimorphism, 45-46. 

 Diploid, 17. 



Ditetragonal prism, 22. 



pyramid, 21. 

 Dodecahedron, 14. 

 Domes, brachy, 33. 



clino, 35. 



macro, 33. 



ortho, 35. 

 Ductile, 43. 

 Dull luster, 43. 



Elements, 44; list, 135-36. 

 Extinction between crossed nicols, 

 13, 25. 



Fibrous, 40. 

 Flexible, 43. 

 Fluorids, 63-66. 

 Foliated, 40. 

 Form, ideal. 13. 

 Forms, definition, 11. 

 Formula of minerals, 45. 

 Fracture, 42. 



