234 Scientific ^nteUigence. [March, 



This mineral is found in the lime quarry of Kulla, at Kimito, in 

 Finland. The colours of this mineral are brown, brownish-yellow, and 

 blackish-brown. It occurs compact, sometimes in crystalline planes, 

 which indicate the rhomboidal dodecahedron with replaced edges : 

 there seldom occur more than one perfectly crystallized plane with 

 parts of the others, they incline at an angle of 120° to each other. 



The fracture is small, conchoidal, splintery, and strongly resemble* 

 that of common resin. 



The crystalline planes are highly splendent ; the crystalline transi- 

 tion planes sometimes shining, sometimes dull ; the lustre is greasy. 

 "When broken of the fragment, have a lustre between the vitreous and 

 resinous; when thin, they are translucent. 



Hard ; brittle ; give sparks with the steel : scratch glass and feld- 

 •par, but are scratched by quartz. 



The specific gravity of this substance is 3 6096 at 60° Fahr. It if 

 of light-yellow when powdered. 



It melts without eftervescence in the interior flame of the blow-pipe, 

 giving a button of the same colour as the mineral, except when the 

 flame is smoky when it is blackish. 



Five grammes analyzed in the general way by fusing with carbonate 

 of potash and dissolving in muriatic acid, yielded 



Silex 41-2* 



Lime 24^ 76 



Alumine 24- 08 



Oxide of iron. 702 



Magnesia and oxide of manganese. 092 

 Volatile parts, and loss 1*98 



Neither the magnesia nor the oxide of manganese appear to belong 

 to the chemical constituents. The oxygen in the lime is three times; 

 the oxygen in the alumine five times, and the oxygen in the silex nine 

 times the quantity of the oxygen in the oxide of iron, themineialogical 

 formula of course will be ='F S -j- 3 C S + 5 A S, or (F S + 2 A S, 

 + 3 (C S + A 8). _ 



PyralloUl. — A new mineral belonging to the talc family. 



Among the minerals found in the lime-quarry of Storgard in the 

 point ot Pargas, there is one, which at first was considered to be crys- 

 tallized talc. It has the singular propensity of blackening before the 

 blow pipe at a low red heat, and it afterwards becomes white at a 

 higher temperature. It occurs in opaque sparry limestone accompa- 

 nied with feldspar, augit, skapolit, moroxit, and sphene, and particu- 

 larly crystallized with augit, which mineral often thinly covers it. His 

 Excellency Count Steinheit who has examined the quarries of Parga 

 with the greatest care, and ro whose zeal the mineralogist is indebted 

 for the discovery of most of the new linnish minerals, was also the 

 first who gave attention to -this mineral. 



This mineral is found in crystalline masses, and in distinct crystals of 

 four varieties of form. 



In quadrangular prisms, of which the angles are 94° 36' and 85° 24', 

 and which are, therefore, slightly rhomboidal, the opposed lateral planes, 

 two and two, differ in breadth ; the plane M and its opposite plane 

 (Plate V), fig. 9, being much broader than T and its opposite plane. 

 /onM 140° 49^. 



