Sullivan — On Augite and Hornblende , 
43 
simple and twin crystals of augite of the form oopoo . ( oopoo ). p. from 
the lava of Monte Eossi or Etna, there are sometimes wholly or par- 
tially enclosed smaller twin crystals of Labrador feldspar."^' Weddingf 
observed under the microscope, occasionally, colourless transparent 
prismatic needles, rounded at the end, and cut perpendicularly to 
their length, by what appeared to be cleavage planes. These crys- 
tals lay in oblique positions towards each other, and were probably 
felspathic. Crystals of leucite have been observed partially included 
in augite :\ the converse is common enough. Hexagonal crystals of 
nephelin occur in augite crystals of the usual form, having the faces 
oopoo dominant, in the nephelin rock of Meiches in Hesse. § Sandber- 
ger|| has also observed nephelin enclosed in the augite crystals, from 
the basalt of JSTeurod in Nassau. I^eedles of nephelin are found 
sticking through crystals of augite, in the cellular hollows of sanidin 
blocks of the Aschberg in the Ehon mountains.^ Scales of white 
talc occur in elongated actinolite prisms from the Zillerthal.^'"^' Scales 
of brown mica occur in the beautiful green elongated prisms of 
actinolite, having the faces oop. ( oopcjo ) from the talc slate of Ziller- 
thal, in South Tyrol. Eed crystals of garnet often occur in the 
actinolite of Schneeberg in Saxony, and Sterzing in Tyrol. Seyfert 
and Sochting have found idocrase in hornblende from Vesuvius. 
Small crystals of black garnet occur in semi-transparent green crystals 
of augite, having the form oop. oopoo . ( oopoo ). p. from Somma.ff 
Bright reddish-brown crystalline particles of olivin, have been found in 
a crystal of hornblende, from the basalt of Hartlingen by Sandberger. J{ 
The same observer has described a large augite crystal from the same 
locality, containing particles of a mineral which appeared to be cry- 
Bolite in the first stage of decomposition. In the single and twin crystals 
of augite from Monte Rossi, and Atro del Cavallo, Vesuvius, small oil- 
green grains of olivine occur. Similar grains are to be found in loose 
crystals, ejected from the crater of Stromboli. Disthene, or cyanite, is 
frequently found enclosed in the red amphibol, or Karinthin crystals, 
which occur with cyanite, garnet, and amphibol, on the Saualpe, in 
Carinthia. 
In a considerable collection of specimens of actinolites, from various 
localities, especially Irish, I have almost always found minute red 
garnets. In the fine felted actinolite rocks, they are often so abun- 
dant that, in washing the finely ground mineral, the garnets sometimes 
collect together as if powdered cinnabar were mingled with the 
mineral. Sections of aluminous hornblende crystals almost always 
exhibit under the microscope minute veins, and sometimes distinct 
crystals, having all the appearance of feldspar. I have also found in 
* Elum, op. cit.y 44. 
t De Vesuvii Montis lavis., Dissert, inaug. Berol, 1859, 13 ; and Zeitsclirift, 
d. deutsch., geolog. Gesellscliaft, x. 381. % Ibid. p. 13, 
§ Blum, op. cit., 44. || Poggend. Annal., Ixxxiii. II Wedding op. cit., p. 12. 
** Blum— Die Pseudomorph. d. Mineralreichs. 45. ff Blum, op. cit. 43. 
XX Poggend. Ann,, Ixxxiii. 454. 
