318 DESCRIPTIONS OF MINERALS. 



Carolina; Hallite from Lerni, Delaware Co., Pa.; ProtovermicuHte 

 from Magnet Core, Ark., are other micaceous hydrous unisilicates 

 similar to vermiculite and jefferisite in exfoliation. Kerrite and 

 Maconite are related to the above. They are from Franklin, Macon 

 Co., Xorth Carolina. PeUiamite is from Pelham, Mass. 



Penninite.— Chlorite in part. Pennine. 



Ehomboliedral. Cleavage basal and highly perfect, mica- 

 like. Also massive, consisting of an aggregation of scales, 

 and cryptocrystalline. 



Color green of various shades ; also yellowish to silver- 

 white, and rose-red to violet. Lustre pearly on cleavage 

 surface. Transparent to translucent. Lamina? flexible, 

 not elastic. H. = 2-2-5. 3 on edges. G. = 2-6-2*85. 



Composition. A specimen from Zermatt, in the Pennine 

 Alps, afforded Silica 33*64, alumina 10*64, iron sesquioxide 

 8-83,' magnesia 34-95, water 12 --10 = 100-46. The rose-red, 

 from Texas, Pa., gave Silica 33-20, alumina 11-11, chro- 

 mium oxide 6-85, iron sesquioxide 1'43, magnesia 35 '54, 

 water 12-95, lithia and soda 0-28. potash 0-10 = 101-46. 

 Other Texas specimens afforded - 90 to 4'78 per cent, of 

 chromium oxide. 13. B. exfoliates somewhat and fuses with 

 difficulty. Partially decomposed by hydrochloric acid, and 

 wholly so by sulphuric acid. 



From Zermatt, Ala in Piedmont, the Tyrol, etc. Kcim- 

 mererite, Rhodoclirome, and Rhodophyllite include the red- 

 dish variety from near Miask, Ptussia ; Texas, Pennsylva- 

 nia ; etc. Pseudomorphs after hornblende, named Loganite, 

 have the composition of this species ; and so has the mas- 

 sive mineral called Pseudojjldte and Allophite. 



Delessite. A fibrous mineral near the above in composition, from 

 amygdaloid at Oberstein. 



Euralite is an amorphous chlorite near Penninite, from Eura, Fin- 

 land ; from amygdaloid. 



Diabantite {Diabantoclironyri) is a chlorite from amygdaloid. A 

 Farmington (Conn.) specimen afforded Hawes, Silica 38*63, alumina 

 10 84, iron sesquioxide 2-88, iron protoxide 24*33, MnO and CaO 1-11, 

 magnesia 16*52, soda 0*33, water 1002=99-69. 



ChloropluEite is a doubtful species of chlorite, from amygdaloid. 



Ripidolite. — Chlorite, in part. 



Monoclinic. Similar in cleavage and mica-like character 

 to penninite, and also in its colors, lustre, hardness and 

 specific gravity. 



