558 Arrant; ement of Minerals. 



1, Spumaceous Manganese-Froth. {Black Wad. Scaly brown man- 

 ganese-ore, Manganesehydratemetalloide argentine J Haiiy. Man- 

 ganese schaum. Brauner Eisenrahm, in part). 



Genus III. Manganesian Earthy Cobalt. 

 Amorphous. Aspect not metallic. Hardness = 1.0 — 1.5. Sp. 

 gr. = 2.2. 



1. Uncleavable Manganesian Earthy Cobalt {Black Cobalt- Ochre. 

 Schwarzer Erdkobold. Erd Kolalt). 



Order III. STEATITE. 



Not metallic. Streak white. Hardness = 1.5 — ^4.0. Sp. 

 gr. =2.47— '3.0. 



Genus I. Steatite. 



Pseudomorphous. Amorphous. Hardness = 1.5 — 3.0. Sp.gr. 

 = 2.6 — 2.92. 



1. Common Steatite. 2. Glyphine-Steatite (^^fa/wa^o/iYe or i<'«^wre- 

 stone). 



Genus II. Serpentine. 

 Rhombohedral. Prismatic. Cleavage very imperfect. Hardness 

 = 2.0 — 3.0. Sp. gr. = 2.5 — 2.9. If hardness = 3.0 and less, it 

 is rhombohedral, or sp. gr. 2.5 — 2.6. 



1. Rhombohedral Serpentine, or Finite. 2. Prismatic Serpentine 

 (Serpentine of geologists ) . 



Genus III. Picrosmine.* 

 Prismatic. Hemiprismatic. Tetarto- prismatic. Cleavage distinct 

 in many directions. Hardness = 2.0 — 4.0. Sp. gr. = 2.4 — 2.7. 

 1. Prismatic Picrosmine. 2. Peritomous Picrosmine (Killinite). 

 3. Hemiprismatic Picrosmine {Marmolite), 4. Tetarto-pris- 

 matic Picrosmine (Pyrallolite). 



Order IV. SPAR. 



Not metallic. Streak white, reddish-brown, blue. Hard- 

 ness = 3.5 -^ 7.0. Sp. gr. = 2.0 — 3.7. 



t 

 Genus I. Schillerite. 



Prismatic. Hemiprismatic. Tetarto-prismatic. Cleavage mo- 

 notomous, perfect. Metallic pearly lustre. Hardness = 3.5 — 6.0. 

 Sp.gr. =2.6 — 3.4. 



1. Common Schillerite {Diafamous Schillerite'). 2. Bronze Schil- 

 lerite or Bronzite {Hemiprismatic Schillerite^ or Foliated Antho^ 



* ricrosmine, from vrix^is, bitter, and Ufih, odour, in allusion to vhat is 

 called tbo bitter odour of the moistened mineral. 



