5.5-6


4.14-4.6


5-5.5


Botry. ;
incrust.
F. splintery




Deep red


Bmh-red


3.5-4


5.85-6.15


2.5-3


Iso.
F. conch,
or uneven




Fe-gry. to
blk.
Gryh-blk.
3-4


5.82-6.25


3


Mon.; mass.
C. basal, per.
F. conch, to
uneven




Dk. gryh-blk.
to bmh-blk.
Blk.
5-5.5


7.2-7.5


3-3.5


Mon. ; us. xls.
C. pinac, per.
F. uneven




Blk.
Bmh-blk.
4-4.5


6.8-7.11


3.5


Mon.
C. pinac, per
F. uneven




Dk. bmh-blk.
to steel-gry.
Bmh-blk.
to steel-gry.
6-6.5


4.75-4.82


4.5-5


Tetr.
C. pyram., per.
F. uneven




Fe-blk. to
bmh-blk.
Dk. red
to blk.
6


5.3-7.3


5-5.5


Orth. ; us. xU. ^


F. uneven


tl

a


Velvet-blk.
Dk. rdh.-
bm.
5-6


5.6-5.8


4.5-5


Orth. ; us. mass.
F. conch.
als


Brn. to pitch-
blk


Gry.
5.5-6


3-4.2


2.6


Mon. ; us. mass.
F. uneven to
conch.
).
Fe-blk.
Blk.
5.5-6


3.99-4.05


2.5


Orth.; us.
prism.
F. uneven




Sn-wh.
Sn-wh.
2-2.5


6.1-6.3




Hex. rhom. ;
us. mass.
C. prism., per.
Steel-gry. to
Pb-gry.
Gry.
2.5-3


8.3-8.5




Iso.; us. mass.
F. uneven




Steel-gry. to
Fe-blk.
Gry.
2.6-3


8.7-9.02


1.5


Massive


F. uneven




Steel-gry. to
Ag-wh.
Gry.
1.6-2


7.9-8.3




Mon.
C. pinac, per.
F. uneven


«


Ag-wh. to
brass-yel.
Gry.
2.5 8.35




Orth.; us.
prism.
C. basal, per.
76



SECTION







Name.
Composition.
Very brittle; uneven to
conchoidal fract.
Calaverite

T305 S106


(Au,Ag)Te»




Bi w. soda
on ch.
Red subl. on ch. w. "bis-
muth flux"


Tetradymite

T284 S39


Bi2(Te.S),




Pb w. soda
on ch.
PbS04 ppt. w. H2SO1 in
HNO3 sol.
Altai te
T288 S51


PbTe




Nagyagite
T305 S105


Au, Pb, Sb, Te, S



SECTI<



Strongly mag.
before heating
ing. (Cp. plat-
inum, which


Completely sol. in H CI ; sol. reac.
for both ferrous and ferric Fe.
