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From the Philosophical Magazine for May 1S55.

NOTE ON

THE MINERAL WILSONITE.

T. S. HUNT,

OP THE GEOLOGICAL COMMISSION OF CANADA.

TN the Supplementary Number of this Magazine for July
J- 1854, p. 499, I published descriptions and analyses of two
minerals occurring in crystalline limestone in Bathurst, C.W.,
one of which I proposed as a new species with the name of Wil-
sonite. It was described as forming rose-red, translucent, clea-
vable masses, probably monoclinic in crystallization, with a hard-
ness of 3-5, and a density of 2765 to 2-776. Lustre vitreous,
shining occasionally, pearly on the cleavage surfaces. One of
three analyses gave silica, 43-55 ; aluminn, 27-94; oxides of iron
and manganese, -20 ; lime, 6-50 ; magnesia, 3-81 ; potash, 8-37 ;
soda, -95 ; water (loss by ignition), 8-61 = 99-93. With two
other specimens the amounts of silica, alumina, magnesia, and
alkalies were very nearly the same, while the loss by ignition
was 9-40 and 9-00, and the amounts of lime respectively 6-94
and 6-72.

The subsequent examination of more perfect specimens in the
possession of Prof. E. J. Chapman has shown him that this
mineral is triclinic, with inclination to the right, and he has
kindly furnished the following notes : — " I give you as approxi-
mations, the following angles from cleavage faces by the common
goniometer:— P:T=: 94°; P : er=145°; T : e=129°; P : M and
T: M = 110° to 115°. Cleavage with P and T perfect, less so
with M ; the cleavage with e is not easily obtained, but is very

distinct and even. Hardness, 3"5 on the more facile clcavagea
and their combination edges; 5"5 on the ends of the prismatic
concretions. Density, 2*77."

; Prof. Chapmaij also pointed out to me the existence of inter-
mingled carbonate of lime in the specimens which I had previ-
ously analysed, and showed that the loss by ignition was in part
carbonic acid. I have since found that the finely pulverized
mineral yields up nearly the whole of its lime with effervescence
to cold dilute hydrochloric acid, which does not attack the sili-
cate. This still retains its rose colour, and is a hydrous silicate
of alumina and potash with a little magnesia. The following are
the results of the analyses by myself of two specimens, purified
by dilute acid (one being from the same mass as the one given
above), and a partial analysis of a third specimen by Prof. H.
Croft, which he has kindly communicated to me.

II. III.

Silica ....

47-50

47-70 47-42

Alumina . . .

3117

31-22\ r34-80
4-14J \ -73

Magnesia . . .

4-25

Lime ....

1-51

•39 -42

Potash ....

9-22

9-38

Soda ....

•82

•95

Water (by ignition)

5-50

5-35

99-97

99^13

The mineral freed from carbonate of lime seems to be constant
in composition ; and from its crystallization and density, as well
from its chemical constitution, to pertain to the felspars.

Montreal, March 22, 1855.