694 



INDEX 



Pectolite, 427, 603, 673. 

 Peganite, 518, 656. 

 Penfieldite, 647. 

 Pentagonal dodecahedron, 60. 



didodecahedron, 61. 

 Pentlandite, 308, 630. 

 Percussion figure, 489. 

 Percylite, 644. 

 Periclase, 340, 663. 

 Pericline, twins, 410. 

 Peridote, 446. 

 Periodic table, 223. 

 Perovskite, 505, 634, 668. 

 Perpurite, 654. 

 Perthite, 408. 

 Petalite, 675. 

 Petzite, 626. 

 Phantoms, 276. 

 Pharmacosiderite, 652. 

 Phase, 238. 



Phenacite, 99, 452, 682. 

 Phenocrysts, 216. 

 Phillipsite, 479, 673. 

 Phlogopite, 494, 601, 672. 

 Phoenicochroite, 649. 

 Phosgenite, 647. 

 Phosphates, 236, 507. 

 Phosphorescence, 279. 

 Phosphorus, tests, 590. 

 Phosphosiderite, 510, 654. 

 Phosphuranylite, 655. 

 Physical properties, 256. 

 Picotite, 372. 

 Picromerite, 539, 638. 

 Piedmontite, 467, 666. 

 Pinacoid, 68. 



basal, 116, 123. 



brachy-, 116. 



cleavage, 256. 



clino-, 123. 



macro-, 116. 



ortho-, 123. 

 Pinakiolite, 664. 

 Pinnoite, 664. 

 Pirssonite, 661. 

 Pisanite, 540, 641. 

 Pisolitic, 271. 

 Pitchblende, 525. 

 Pitt diamond, 282. 

 Pitticite, 652. 

 Placer mining, 291. 

 Plagioclase, 411, 614. 

 Plagiohedral, 26. 

 Plagionite, 624. 

 Plane, axial, 173. 



basal, 68. 



composition, 138. 



diametral, 16. 



of polarization, 176. 

 Plane of symmetry, 13. 



of vibration, 176. 



Plane, parametral, 23. 



twinning, 138. 

 Planoferrite, 658. 

 Plaster of Paris, 537. 

 Platinum, 287, 631. 



forceps, 554. 



tests, 582. 



wire, 553. 



Plattnerite, 628, 649. 

 Pleochroism, 189. 

 Plumbago, 284. 

 Plumbojarosite, 647. 

 Pneumatolysis, 248. 

 Point-system, 5. 

 Polar, 55. 



axis, 55. 



digonal, 124. 



didigonal, 117. 



dihexagonal, 92. 



ditesseral, 54- 



ditetragonal, 71. 



ditrigonal, 103. 



hexagonal, 99. 



tesseral, 62. 



tetragonal, 78. 



trigonal, 110. 

 Polarization, of light, 175. 



circular, 176, 196. 

 Polarizer, 177. 

 Pole of face, 43. 

 Polianite, 632. 

 Pollucite, 679. 

 Polyadelphite, 444. 

 Polyargyrite, 326, 625. 

 Polybasite, 326, 624. 

 Polycrase, 635, 668. 

 Polydymite, 307, 630. 

 Polyhalite, 662. 

 Polylithionite, 496. 

 Polymignite, 635. 

 Polymorphism, 219. 

 Polysynthetic twins, 142. 

 Positive birefringence, 169, 170. 

 Positive forms, 27. 

 Potash alum, 542. 

 Potash feldspar, 403. 

 Potash mica, 489. 

 Potassium mercuric iodide, 263. 

 Potassium, tests, 563. 

 Powdery, 269. 

 Powellite, 544, 670. 

 Praseodymium, tests, 572. 

 Precious garnet, 443. 



opal, 369. 



Prehnite, 470, 604. 676. 

 Pressure figure, 490. 

 Priceite, 525. 

 Primary optic axes, 172. 

 Primary minerals, 244. 

 Primitive circle, 43- 

 Prism, 113. 





