Chap. XVI J 
GONDITE SERIES : PETROLOGY. 
329 
Lists of Rocks. 
Space will not permit me to give in this Memoir a detailed account of 
the petrological characters of these rocks ; so that I propose to first give 
a classification of the various rocks that have so far been found in these 
masses of manganese-bearing rocks and ores, and then to give short petro- 
logical accounts of the commonest and most characteristic varieties. 
The following list gives a classification of the rocks found up 
to the present in the gondite series. From this list, however, the 
rocks containing manganese-ores have been omitted, because it is impos- 
sible to decide which of them are to be regarded as the direct product of 
the metamorphism of the original manganiferous sediments and which 
have been produced by the chemical alteration of the manganese-silicate- 
rocks. The parting layers of quartzites and micaceous schists separating 
the layers of manganese-silicate- rock have also been omitted from this 
classification, because they will be given in a separate list later on. 
List of iJie rocks found in the gondite series as represented in the Central 
Promnces. 
With quartz. 
Gondite 
Bhodonite-gond ite 
Apatite-gondite 
Amphibole-gondite 
A mph ibole-rhodon ile-gond tie 
Aniphibole-apatite-gondite 
Magnetite-gondite 
Rhodochrosite-goiidite 
Orthoclase-gondite 
Microcline-gondite 
Pyroxe-ie (brownl-micr, cline- 
gondite 
Orthoclase-amphibole-rhodonite. 
gondite with rhodochrosite (?) 
Rhodonite-quart i-rock 
Without quartz. 
Spessartite-rock 
Rhodonite-spessartite-rock 
Apatite-spessartite-rock 
Amphibole-spessartite-rcck 
Amphibole-spessartite-rhodouite- 
rock 
Magnetite-spessartite-rock 
Rhodochrosite-spessartite-rhodonite 
rock 
R hodochrosite-rhod oni te - rock 
Spessartite-orthoclase-rock 
Apatite-felspar-spessartite-rock with 
mica 
Rhodonite-rock 
Rhodonite-rock with magnetite. 
spessartite, and manganese-mica 
Barytes-spessartite-rhodonite ro'ik 
Barytes-spessart ite-rhod onite- rook 
with a manganesian phosphate 
II G 
