* 
B. Minerals transpa- 
1. Minerals crystallizing in the Isomet7'ic System. 
Name. 
Chemical comp and 
reactions. 
Specific 
Gravity. 
Cleav- 
age. 
Unsual combi- 
nations Cfform 
of sections. 
Trains . 
Color and 
amount of 
7 'e fraction. 
I. Hauyn 
Group. 
a. Socialite 
3 (Na, [Al,] Si, 
Og)-f 2 Na Cl. Cl 
reaction. Easily 
soluble in H Cl. 
leaving a gelatin- 
ous residue of Li 
0.,. On evapora- 
tion, cubes of salt. 
2.13-2.2C; 
i 
Granular and 
i (rarely i. H) 
sections cpiad- 
ratic and hex- 
agonal. ! 
Inter- 
pen’tra 
ting 
twins 
in a tri- 
gonal- 
secon- 
dary 
axis. 
i 
Colorless, 
red from 
presence 01 
Fe-i O3, 
greenish or 
bluish, blue. 
1 
b. Hauyn 
i , 
and 
i 
ic. Nosean. ; 
1 
1 
i 
2, (Na, Ca) (Al,) 
Si, Og-t-(Na,, Ca'i 
SO^. Reacts for Ca 
and H, SO^. 
3 Na, (Al',) Si, 
Og-f-Na, SO^. 
Reacts for H, SO^ 
Koth are soluble 
in HCl with sepa- 
ration of gCiatinous 
Li 0 , 
2.4-2. 5 
1.279- 
2.390. 
i 
1 
j 
Crystals i and 
I as the above 
'Crystals usu- 
ally corroded. 
1 
Twins 
ini&as 
above 
1 
Colorless, 
blue, black. 
Colorless, 
brown black 
1 
[2. Garnel 
! Group. 
a Alma 
nacline. 
1 
Fe,^ (AI2 ) Si^ O12. 
1 
1 
1 
i 
3.78 
^3 1-4 
Imper. 
in 
i 
j 
i 
i, 2-2 and 
granular. Sec- 
tions quadrat- 
ic, hexagonal 
or octagonal. 
Red, in very 
thin secti’ns 
nearly color- 
1.772. 
b. Pyrope. 
'(Ca 0 , Mg 0 , Fe 
c) Mn O) Al, O3 
3Si 0-2 containing 
chromium. 
3 - 7 - 3 -S 
1 Imper 
I i 
' Granular. 
1 Blood red. 
