24 A New Mine i 'illogical Nomenclature. 



Genoa 4. Clasistylus.* 



11=6 — 6.5. G=2.3 — 3. Color light-green; colorless. Commonly botryoidal. 

 Sp. 1. C. acrotomus, Prchnitc. 



Genus 5. Nephrus. 

 H=5.5— 7. 0=2.9—3.4. Massive. 

 Sp. 1. N. amorphus, Nephrite. 



2. N. peritomus, Saussuritc. 



Genus G. Petalub. 



H=6— 6.5. G =2.4—2.5. Massive. 



Sp. 1. P. rhombicus, Petalite. 



Genus 7. Lazulus. 

 H=5 — 6. G=2.8 — 3.1. Color blue or green. Cleavage indistinct. 

 Sp. 1. L. amorphus, Turqvois. 



2. L. rhombicus, Lazulitc. 



3. L. triclinatus, Blue Spar. 



Genus S. Spatum. 



H=4— 0.5. G=2.1— 3.1. 



Sp. 1. S. hexagonum, Nepheline. 



2. S. Herschellianum, Herschcllite. 



-">. S. oleaceum, EUcolitc. 



4. S. opalescens, Labradorilc. 



5. S. orthotomum.t Feldspar. 



6. S. gemellum, Pcriclinc. 



7. S. uiclinatum, Albite. 



8. S. Vesuvianum, Anorthite. 



9. S. roseum, Latrohite. 



10. S. quadrature, Scapolite. 



11. S. Gehlenianum, Gehlenite. 



12. S. volcanicum, Gismondinc. 



Genus 9. Spatinius. 



11=5.5—6.5. G=3— 3.5. 

 Sp. 1. 8. decolorans, Manganese- Spar. 



2. S. rhombohedrus, Troostite. 



3. 3. S. reniformis, Bustamitc. 



" ICXiiw, to break, and onSXos, a column, in allusion to the resemblance to a 

 broken column, often presented by tho crystals pf this species. 



t '( \pBis, straight, and rfpu, / cleave, refers to tho fact, that its two cleavages 

 are at right angles with one another. 



