ORYCTOGN OSY. 
TABLE of the Generic External Characters. 
General Generic External Characters. 
i. Thee 
ij. The. coletan of the particles, in relation to which foffils are diftinguifhed into Solid, Friable, and Fluid. 
Particular generic Charagters of old Minerals. 
Particular generic Cha- 
fluid Minerals. 
Particular aaa ee of 
Jriall raters of 
le Miner 
( External fhape 
External afpe& - 
The fra@ur 
Shape of a fragme 
A {pe& of fra&ure - 
Afpeét of the diftin® concre- 
tions - - cretions. 
tion. 
he tranfparency. 
he ftreak. 
Charaers for the Sight. 
General afpe& - 7 
L 
4 tenacity. 
CharaGters for thetouch - he ioe Sole 
a OS Ooo een 
gE ERR ER? g 
a) 
For the hearing - = 
re. 
Luftre of - fra&ture. The luftre 
are ch of the dine cc concre- 
Surface of the diftin& con- 
Luttre of the diflin@ concre- 
xibi lity 
he adhefiont to the tongue. 
he found. 
External fhape. 
The luftre. 
A fpe& of the particles. 
Tranfparency. 
The foiling. Fluidity. 
The friability. 
— general generic Charaéters. 
. The un@tuofity. 
col 
For the touch = The coldne 
v. The weight 
For the fmell vi. The {mell. 
For the tafte vil. The tafte. 
General generic i) ean with their fubordinate 
Specific Charade 
I. The Colour.—This is not only the moft obvious, but 
in many cafes alfo one of the moft certain external characters, 
and even sie as the principal a mark of many 
—— 
I. ree Colours. —Thefe are not derived from the divi- 
of the folar ray by means of the prifm, but are fuch as 
are Seonlileet fimple in commen life. 
White.—Snow-white; the pureft white colour, as in 
quartz, white lead, “Carra ara marble :—reddifh-white, as 
porcelain earth, calcareous {par from Andreafberg, brown 
{par :—ye ellowith- white; in white amber, zeolite :— 
white ; native filver, arfenical pyrites, mica : : — greyith 
common quartz, gr ranular lime-fto green 
anth, talc, tremolite ilk-white’; common op 
amet th -{t :—=tin. een white cobalt ore, native antimony, 
native aa 
—of which {moke-grey is ‘the characteriftic or prin- 
: lead grey ; 
ar :—green- 
ony clay ate common jafper, mica, fuller searth :— 
hina be ; iron fpar, indurated marle, common clay 
iron-ftone eel-grey, grey copper ore, radiated grey man- 
ganefe ore _ ey; bafalt, wacke, fome varieties of 
clay-flat 
Black. —Of 
blende, ti 
obfidian ne, common aaa :—blueifh- black ; 
black he cob black lead o 
Lu s the Pruffian or "Berlin blue is the charac- 
yit, apatite :— plum i 
blue; porcelain nee fae Sicce idioiarpens — {malt 
ue 5 iro dor azure copper :—fky blue; feldfpar 
of Krieglach, turquo 
=the ureft ‘af its t 
don 
