360 Arrangement of Minerals, 



5. Levyne-Zeolite. 6. Hexagonal Zeolite {Gmelintte). 7. Biato- 

 moiis Zeolite (Laumonite). 8. Prismatic Zeolite {Mesotype 

 Fibrous Zeolite. Natrolite). 9. Skolczite Zeolite {Mesotype of the 

 Feroe Islands), \0. Com\)iomiQ ZQoXiiQ {Mesole of Berzelius'), 

 11. Orthotomous Zeolite {Thomsonite). 12. Prismatoidal Zeolite 

 {Radiated Zeolite of Wern. Stilhite, H. in part). 13. Hemi- 

 prismatic Zeolite {Foliated Zeolite. Heulandite. Stilhite in part, 

 H.) 14. Diplogenous Zeolite {Epistilbite, R.) 15. Megallogo- 

 nous Zeolite {Brewster ite). 16. Pyramidal Zeolite {Apophyllite). 



tttttt 



Genus VIII. Edingtonite. 

 Pyramidal. Cleavage peritomous. Hardness =: 4.0 — 4.5. Sp. 

 gr. =2.7 — 2.75. 



1. Pyramidal Edingtonite {Hemipyramidaler Feldspath, Haid) . 

 Genus IX. Elaine-Spar.* 

 Rhombohedral. Pyramidal. Cleavage not axotomous. Hardness 

 = 5.0 — 6,0. Sp. gr. = 2.4 — 2.8. 



1. Ilhombohcdral Elaine-Spar, or Nepheline {Fettstein, Sornmite). 

 2. Pyramidal Elaine-Spar, or Meionite {Scapolite, Wernerite Pa- 

 ranthine). 3. Peritomous Elaine-Spar or Davyne. 



Genus X. PETALITE.f 



Prismatic. Cleavage perfect in one direction. Hardness = 6.0 

 — 6.5. Sp. gr. = 2.4 — 2.5. 

 1, Prismatic Petalite. 



Genus XI. Felspar. 

 Hemiprismatic and Tetarto-prismatic. Cleavage perfect in two 

 rectangular or nearly rectangular directions. Hardness = 6.0. Sp. 

 gr. =2.5 — 2.78. 



1. Common Felspar {Orthotomous Felspar, Ice-Spar , Feldstein in 

 part). 2. Ryakolite-Felspar(G/a*5i/ Felspar in part). 3. Spo- 

 dumene-Felspar {Natron Spodumenc of Berzelius. Oligohlase 

 Breit). 4. Albite-Felspar (including part of common felspar of 

 some authors. Schorl hlanc, Rome de I'lsle. Albit, G. Rose, 

 and Leonli). 5. Anorthite-Felspar {Anorthite, G.Rose, Chris- 

 tianite Monticelli). 6. Polychromatic or Labrador Felspar. 

 Genus XII. Chiastolite. 

 Prismatic. Black marking in the interior of the crystals. Hard- 

 ness = 5.0 — 5.5. Sp. gr. = 2.9 — 2.95. 

 1. Prismatic Chiastolite. 



* Elaine f from tXa/ev, oil, in allusion to its oily aspect. 

 t Petalite, from mrxXos, expanded, in reference to the great magnitude of 

 the primitive angle, 



