Chap. XVI.] 
GONDITE SERIES : PETROLOGY. 
325 
were deposited to those under which the manganese-oxide sediments were 
laid down cannot have been quite sudden. Amongst the minerals con- 
taining manganese that occur in the 'coimtry' of the deposit as dis- 
tinct from the deposits themselves, are the following : — manganese-garnet, 
manganmagnetite, and ottreUte ; whilst psilomelane and pyrolusite are 
often formed in the 'country' by secondary infiltration of manganese- 
bearmg solutions from the ore-bodv. The following is a fuH list of the 
minerals recognised in the 'country' of the masses of manganese -silicate 
rock and manganese -ore : — 
List of minerals found in the rocks forming the 'country ' of the manganese- 
ore deposits. 
Apatite 
Muscovite 
Biotite 
Ott.elite 
Braunite(?) 
Piedmontite 
Calcite 
Pkgioclase 
Chaleopyrite 
Psilomelane 
Chlorite" 
Pyrolusite 
Diop^ide 
Quartz 
Enstatite{?) 
R utile 
Epidote 
Sappbirine 
Garnet 
Sea polite 
Hematite 
Sericite 
Hornblende 
Spessartite 
Ilmenite 
Sphene 
Magnetite 
Talc 
Manganmagnetite 
Tourmaline 
Martite 
WoUastonite 
Microcline 
Zircon 
Petrology of the Gocdite Series- 
We can now deal with the question of the nomenclatiire of the rocks 
Nomenclature of of the gondite series. The type rock is one composed 
the gondite series. practically entirely of a manganese-bearing garnet 
approximating in composition to spessartite, and of quartz. The 
garnet occurs as a large number of tiny round grains set in a matrix of 
mosaic quartz, the grains of which are usually of about the same size as 
the garnet grains. The rock appears to the unaided eye as a very fine- 
grained rock of which the structiire just seems visible. The characters of 
this rock will be given in more detail later. This is, however, the rock to 
which it is proposed to give the name gondite. Similar rocks have pro- 
bably been found in the metamorphic rocks of other parts of the world, 
e.g. in Texas ^ ; but I am not aware that any name has ever been given 
to such rocks. Probably they have not pre^^ously been found in 
1 Penrose, An. Rep. Geol. Sun: Arl-arisas for 1890, Vol. I, Chap. XVI. 
