Miscellanies. 395 
5. Needle Ore.—This was first analyzed by John, who proved 
that it was not, as had been previously supposed, an ore of chrome, 
but a combination chiefly of bismuth, lead, copper, and sulphur, in 
which the proportions were as follows ; Bismuth 43.20, lead 24.32, 
copper 12.10, nickel 1.58, tellurium 1.32, sulphur 11.58, loss 
5.90 ;=100.00. Ina late analysis of this ore by Hermann Frick, 
in Poggendorf’s Annalen for 1834, the nickel and tellurium (which, 
by the by, John had placed as conjectural substances) were not 
found. After repeated analyses, he gives the following as the com- 
_ position of this ore: Sulphur 16.61, bismuth 36.45, lead 36.05, cop- 
per 10.59, ;=99.70. ‘The formula of composition, CopBi+2PbBi. 
lb. 
6. Platina and Gold of the Uralian Mountains.—It would ap- 
pear, from some late investigations, that the platina occurs in dissem- 
inated grains and also in masses of several pounds weight, in serpen- 
tine in which it is associated with chromate ofiron. Part of the gold 
of that region occurs in quartz veins, along with auriferous iron-pyri- 
tes, and grains of gold have also been detected in the serpentine. 
The chlorite slate of the Urals probably also contains platina.—Jb. 
7. Idocrase in the Isle of Skye. Discovered by G. B. Green- 
ough, Esqg.—This mineral was found at the junction of a trap dike 
with the calcareous rock it traverses. Its locality is about a mile and 
a half south of Broadford, on the way to Kilbride. ‘The dike avera- 
| ges about four yards in width. Mr. Greenough could not determine 
its extent, from the heather, &c. which covers the surface.—Jb. 
8. Chiastolite—According to Dr. G. Landgrebe of Marbourg, 
as stated in Schweigger-Seidel’s Journal, H. 5, 1830, this mineral 
contains, silica 68.497, alumina 30.109, magnesia 1.125, water and 
carbon 0.269 ;=100.00. The remarkable structure of this mineral 
is well known; we may add, from Weiss, that many salts, as muriate 
of soda for example, when dissolved in fatty substances, as butter, 
and again crystallized from them, exhibit in their crystals the same 
structure as observed in chiastolite.—Jd. 
9. Antimonial Nickel.—Our latest discovery from the ever inex- 
haustible Andreasberg is a very interesting mineral, a combination of 
nickel and antimony, resembling at first sight coppernickel ; but hav- 
ing attracted the attention of a pupil of mine, Mr. Charles Volkmar 
