ON THE RUBIES OF BURMA AND ASSOCIATED MINERALS. 
165 
After washing the sand for the rubies they contained, the gravel remaining is chiefly 
of fragments of quartz, gneiss and pegmatite, amongst which are spinel, garnet, 
tourmaline, and rock-crystal. 
The following is a more detailed account of the deposit as examined in the pits at 
work. Between No. 8 and No. 9 mine, in a small section on the river bank, is a dark 
sandy loam resting upon a heavy brown clayey loam, with gravel and blocks of gneiss. 
In Twinlone 6, near by, is 6 feet of dark brown loam on gravel in which is gneiss 
and pegmatite rubble, containing numerous garnets ; and in the stream near by are 
huge rounded blocks of coarse pegmatite, some of which are 80 feet long and 15 feet 
high. 
ft. in. 
Twinlone 5. Grey sand and gravel amongst large gneiss boulders .... 10 0 
Twinlone 3. 1. Brown sandy loam. 4 0 
2. Bluish-grey sand and gravel with garnetiferous gneiss rubble 3 6 
3. Ruby-bearing gravel and sand.2 6 
10 0 
The bedrock is a decomposed pegmatite. 
Twinlone 1. 1. Brown sandy loam.8 0 
2. Grey finely foliated gneiss and pegmatite rubble, embedded 
in sand and gravel.3 0 
11 0 
Twinlone C. 1. Blackish mud and clay.15 0 
2. Dark greenish-grey ruby-bearing sand, with gneiss pebbles. 2 6 
17 6 
Twinlone E. 1. Yellow loam at surface.2 0 
2. Dark loam.5 0 
3. Brownish clay, with gneiss rubble.13 0 
4. Yellowish ruby-bearing sand and gravel.6 0 
5. Stiff yellow under-clay—depth undetermined. 
27 0 + 
lst Twinlone I had sunk near to Twinlone E. 
1. Brownish-yellow clay.3 9 
2. Dark brown loam.2 3 
3. Drab-coloured clay.6 0 
4. Yellowish ruby sand and gravel, with gneiss rubble and a 
few large blocks of pegmatite.6 0 
18 0 
Yellow under-clay. 
In No. 4 bed was a sloping parting of grey clay, 2 feet thick at the lower 
end, and 6 inches at the upper. 
