534 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
under the name “hydrous anthophyllite.” Doubtless this occurs somewhere 
about Pinbain, in the serpentinous district. 
The mineral bears considerable resemblance to true hydrous anthophyllite, 
in colour, lustre, and in structure ; it also, however, much resembles the fibrous 
tale from Cairney in Aberdeenshire. 
The fibres radiate from separate centres of crystallisation, interlacing at 
their terminations, forming more or less circular masses. The lustre is sub- 
pearly, the colour grey, with here and there a brownish or a greenish tint. 
Specific gravity, 2 * 306. 
In this mineral the change is not altogether what is usual; the silica has 
been reduced to the amount contained in serpentine, before the whole of the 
lime or of the peroxide of iron has been removed. 
1° 303 grammes yielded— 
Silica, . : 5 -516 
From Alumina, . ne 
-518 = 39 -'754. 
Alumina, . ; E ; *493 
Ferric Oxide, . : = «08296 
Ferrous Oxide, . ‘ mone 
Manganous Oxide, . : 23 
Lime, : 4 : = love 
Magnesia, . : 3 . 26:247 
Potash, . < : ; “(OE 
Soda, : ‘ : ‘ 2105 
Water, ; : : » 6832 
100°102 
Loss in bath, - 822. 
30. A still more perfect change is to be seen in the so-called Baltimorite of 
Corrycharmaig, near Killin, in Perthshire. 
This mineral is, from its structure, evidently the result of a change in- 
duced on an asbestiform variety either of augite or hornblende; its associa- 
tion with chromite and ripidolite leads to the assigning it rather to the augitie 
type. 
It is of a fine dark sap-green colour, a fibrous slickenside-like structure 
and lustre ;* it is somewhat brittle, and cuts like slate-pencil. Its specific 
gravity is 2° 628. 
* It may appear strange to speak of a slickenside lustre, but, except in the case of metallic minerals, 
the lustre of all slickenside surfaces is much the same, and quite peculiar ;—it may be said to be the 
lustre of reflected light. 
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