500 PROFESSOR HEDDLE ON THE RHOMBOHEDRAL CARBONATES. 

The colour was, doubtless, due to the large quantity of the manganesian 
carbonate. 
Brown calcite.-—Pointed out to me by Grieve as filling small druses in a 
very friable amygdaloid a little to the west of Kinghorn, Fifeshire, on the 
sea-shore, 
The specimens are of a radiating structure, but not fibrous ;—they at first 
sight resemble brown stilbite. Specific gravity, 2°736. 
When dissolved in dilute acid, numberless minute globules of a light brown 
oily matter separated, and were seen suspended in the liquid; these had a 
pleasant odour, resembling that of hawthorn blossoms. Upon passing the 
solution through a filter, these globules were retained, but rapidly evaporated 
from its surface, leaving the paper somewhat brown tinted. 

Tnsoluble (siliceous), : : ; ; f 056 
Carbonate of lime, . : ; ; ' ; 94:2 
‘3 of magnesia, : : 5 i 5 1:276 é 
) ofiron, . : . : 2 ; 1:628 a 
F of manganese, , ; : ‘ : 1:868 : 
Alumina, : ; ‘ S : : 5 042 
99-07 




The colour probably was derived from the bituminous oil. 
Green calcite occurs with a skin of Delessite in the amygdaloid vein which 
traverses the tuff of the Rock and Spindle, near St Andrews; and which vein is 
connected with the line of volcanic ‘‘necks” to the eastward. Specific gravity, 
2°704. 
Left upon solution 4°376 per cent. of siliceous matter mixed with Delessite. 
This, upon continued digestion in strong hydrochloric acid, left 3-94 per cent. of 
silica ;—'436 is therefore green earth (Delessite). 

Carbonate of lime, . F ; : 2 : 88:08 
5 of magnesia, : : ; : 2 4:996 
f ofiron, . , . 3 F : 2°028 
Fe of manganese, , s : : : 48 
Silica, : : : ; : : : 3°94 
Alumina, ; ; : ; 3 : : 036 
Green earth, . : ' ; : é 2 436 
99-996 
Anthraconite.—From a hill two miles north of Campbeltown, Cantyre. The 
specimen, which was given to me by my late colleague Dr MacponaLp, consisted 
of a saccharoid mass of a dark blue or greyish-black colour; the crystalline 
granules were of the size of peas, and were united by a much paler cement, — 
