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Epilogue

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236                                    GEMS.
2nd. Of the silicates or quartz, amongst whose varieties are :
1.  The agate.
2.   The chalcedonyx.
3.  The carnelian.
4.  The calcedony.
5.  The caeholong.
6.  The jaspar.
7.  The rock crystal.
8.  The Chrysoprase.
9.  The aventurine.
10.  The girasol.
11.  The iris.
12.  The hydrophane.
13.  The amethyst.
14.  The quartz aqua-
marine.
15.  The almandine.
16.   The xyloidina.
17.   The niccolo.
18.  The onyx.
19.   The cat's eye.
20.  The opal.
21.  The plasma.
22.  The sard.
23.  The sard-agate.
24.  The sardonyx.
To the sixth genus, that is, of the aluminates, helong the species—
1st. Of the aluminate of magnesia, amongst whose varieties the principal are :
1. The spinel.               |         2. The balais.
2nd. Of aluminate of glucine, amongst whose varieties are :
1. The chrysoberyl. | 2. The cymophane.
3rd. Of the aluminate of copper, amongst whose varieties is reckoned :
The turquoise.
To the seventh genus of aluminous silicates belong the species—
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