1822.] Scientific Intelligence. 317 
terior flame, it becomes pale, and presents bubbles from time to time; 
in the interior flame, before a strong blast, it melts with considerable 
ebullition. 
6. Dark brownish grey grammatite found at Aker in the same lime- 
stone, and under the same circumstances as the preceding, with which 
also it agrees in characters, except as to colour. It is sometimes 
found crystallized with secondary facets. The oblique angle measures 
124° 31’. 
7. Amphibole from the ‘iron-mines of Nordmark, in Wermeland, 
where it is accompanied by magnetic iron ore, and dark green chlorite, 
und sometimes by colourless apatite. Its colour is black or greenish 
black, it is opaque, and its powder is green. Reduced toa coarse 
powder it is attracted by the magnet, and, after calcination, in frag- 
ments of considerable size. Angle 124° 28’2. Characters before the 
blowpipe the same as those of the actinote of Taberg. 
8. Amphibole from Yogelsburg in Wetterau; matrix probably a 
basalt. Colour black or brownish black, by reflected light ; but red- 
dish brown by transmitted light; translucid, powder rust coloured. 
Crystallized in hexaedral prisms, with facets on the summits; the ob- 
lique angle of the primitive prism 124°32’3. Character before the 
blowpipe as in the preceding, but it is more fusible than any of the 
varieties above described. 
9, and 10. Pargasite and the Amphibole of Pargas. These minerals 
are found in the quarries of carbonate of lime at Pargas in Finland, and 
it is remarkable that notwithstanding their analogy in -composition, 
they never accompany each other, and are never observed to pass into 
each other. The colour of pargasite is green ; that of the amphibole 
is perfectly black. They are found in grains; and in hexaedral prisms, 
having all the facets of amphibole, as well primitive as secondary ; but 
the crystallization of the black variety is always the most complete. 
The green variety is much more translucid than the other. They both 
fuse before the blowpipe with a violent ebullition. 
1 2 C 4 5 6 iu § g* 10 
CALTON a 60°31 | 60°10} 59-75) 58°20} 56-24/47-21} 48-83 142-24 {46-26 |45-69 
Magnesia ........ 24-93} 24°31} 21-10} 22°10) 24-13 121-86} 13-61 {13°74)19-03 |18°79 
Be ae tel cals’ « 13.66] 12°73] 14°25} 15-55} 12-95/12°73} 10-16 ]12°24]13-96]13°83 
Alumina ........ 0.26] 0-42; — 0-14) 4°32/13-94} 7-48/13-92]11-48 |12-18 
Protoxide of iron..| 0°15} 1°00; 3°95) 3°08 1:00} 2-28] 18-:75]14°59| 3°48] 7-32 
Protox. of mangan.| — 0.47} 0°31 0-2) 0°26) 0°57 1-15} 0°37} 0°36} 0:22 
Fluoric acid ...... 0:94} O°83} 0:76} O°66| O'78! 0-90) 0:41 |traces}| 1-60} 1°50 
Water ......... | O10) O-15) — 0-14) 0°50} 0°44] 0-50} — | 0-61] — 
——_ | — ——__ | -—. 
99-95 {100-01 [100-12 | 100-081 100.18|99°931100-89 |97-10 |96-78| 99.59 
The angles of the crystals were measured by M. Mitscherlich. 
_ M. de Bonsdorff observes, that it is a fact worthy of attention, that the 
amphiboles which contain alumina, or those of which the composition 
is most complicated, are almost always found crystallized with se- 
condary facets; while the grammatites, of more simple constitution, 
present only primitive facets—(Ann. de Chim. &c. xx. p.5. From 
the Memoirs of the Academy of Sciences at Stockholm.) 
* This mineral also yielded 0°42 of ‘‘ substance mélangée.”” 
