164 
NON-METALLIC MINERALS. 
9. A LARGE AiVJYGDALGID ill its 
original form, clothed on the inside 
with Amethjst crystals. 
Galgenberg. 
10 to 27. Amygdaloids, of 
more irregular shajie, produced 
either by unequal pressure on the 
sides of the cavities, or by their 
being stretched in the direction of 
the stream when the Melaphyre 
was flowing. 
Galgenberg. 
28 and 29. Portions of a Large 
Amygdaloid filled with Chalce¬ 
dony and Amethyst, and distinctly 
exhibiting one flattened side, or a 
sharp edge. 
Galgenberg. 
30. A similar Amygdaloid filled 
with Amethyst and Agate-jasper, 
with still more irregular form than 
the last. 
GaJgeriberg. 
31. A similar Amygdaloid filled 
with Chalcedony, Quartz, and 
Amethyst. Calc Spar was first 
deposited on the sides, but has 
since been removed by solution, 
the impression of the Calc Spar 
crystals being seen at the two 
openings in the Agate. A crack 
was formed in the Melaphyre 
before the filling of the cavity, 
which shows itself as a channel in 
the outer surface. 
Galgenberg, 
31a. Portion of an irregular 
Amygdaloid partially filled with 
Chalcedony. 
32 to 39. Chalcedony Amyg¬ 
daloids, of very flat shape in con¬ 
sequence of pressure, or the flowing 
of the Melaphyre before the cavities 
Avere filled. 
Galgenberg. 
39a. Segment of a triangular 
Amygdaloid filled with regular 
deposits of Chalcedony, Agate- 
Jasper, and Amethystine Quartz. 
40 to 45. Tavin Amygdaloids, 
two- and three-fold. SeAmral bub¬ 
bles arose at one time in the fluid 
Melaphyre and united in one. 
When the mass Avas in a pasty 
condition they v/ould sometimes 
not unite jierfectly. Nos. 43 to 
45 are portions of a three-fold 
Amygdaloid, showing clearly that 
the filling with Amethyst was a 
later event, quite independent of 
the shape of the cavity. 
Galgenberg. 
46. Chalcedony^ Aaiygdaloid, 
the last filling of which Avas Calc 
Spar. 
Galgenberg, 
I 47. Amygdaloid of Agate-Jas- 
I per, the last filling of Avhich at 
one end is formed of broken Mela¬ 
phyre cemented apparently by 
Silica. 
Galgenberg. 
48 and 49. Portions of a Chal¬ 
cedony Amygdaloid, Avith one 
side apparently corroded. Hydrous 
oxide of iron has been deposited 
here, and mostly again remoA’ed. 
Galgenberg. 
50 and 51. Portions of an Amyg¬ 
daloid, Avitli similar appearances. 
Galgenberg. 
52 and 53. Portions of a large 
Amygdaloid, the Amethyst crys¬ 
tals of Avhich belong to tAvo dif¬ 
ferent periods, between AAdiich 
hydrous oxide of iron Aims intro¬ 
duced. The outer surface is pitted 
Avith holloAvs, or pock marks ” 
caused by removal of hydrous 
oxide of iron and calc spar, Avhich 
AAmre first deposited on the inside 
of the cavity. 
Galgenberg. 
54 and 55. Poi’tions of a fine 
pear-shaped Amygdaloid, sIioav- 
ing the same succession, the second 
formation of Amethyst being in 
their crystalline crusts. 
Galgenberg. 
