PHYSIOGRAPHY. 207 



Figure-stone. 



3. It is found imbedded in Quartz at Kikertaursak, near Cape Fare- 

 well in Greenland. 



FERRUGINOUS PLATINA. 



In crystals and grains. The form of the crystals described as 

 cubical. 



Color dark platina-grey. Surface tarnished, like meteoric iron. 



Hardness == 8-0 ... 8-5. (Scale of BREITHAUPT.) 



Malleable. Sp. gr. = 14-6 . . . 15-7. It is magnetic ; and in 

 some cases not only attracts, but repels the needle. 



1. It gives, by chemical trials, evidence of a considerable portion of 

 iron. 



2. It is found in the platina sand from Nijnotaguilsk in the govern- 

 ment of Perme in Siberia. 



3. Whether it be specifically distinct from Native Platina, stijl admits 

 of a doubt. 



FETTBOLE. 



Massive ; composition impalpable. Fracture conchoidal. Color 

 liver-brown. Lustre resinous. Opake. Hardness =1-50 .. .2-0. 

 Sp. gr. = 2-249. It falls to pieces in water, attended with a crack- 

 ling noise. According to KERSTEN, it consists of a tri-silicate of 

 iron, with 9 proportionals of water. It is, without doubt, an acci- 

 dental mixture of these principles, resulting from the decomposi- 

 tion of some one or more mineral species, 



FETTSTEIN. (See Nepheline.) 

 FIBROLITE. (See Kyanite.) 



FIGURE-STONE. Glyptic Atelene-Picros- 

 mine. 



Massive : composition impalpable. Fracture coarse 

 splintery, imperfectly slaty. 



Color white, grey, green, yellow, red and brown; none 

 of them bright. Acquires some lustre in the streak. Trans- 

 lucent, in most cases, only on the edges. 



Hardness =20 . . . 2-5. Sp. gr. =2.815 . . . 2-9. 



