Mr Haidiilger on the Series of' CryslaUisation cfApaiiie. 14-7 
The observed varieties with II — oo in asparagus-stone, and 
others like lig. 12., without it, in the apatite irom Ehrenfrieders- 
dorf in Saxony, although not of a general occurrence, are suffi- 
cient to remove this last supposed difference : the combination 
in %. 12. is P—1. 2(R). P+oo ; the angles of P—1 157'' 
33'; 45" 49'. 
The crystalline forms occurring in asparagus-stone, both of 
the asparagus green varieties from the Cabo de Gata, and of the 
dark bluish-green from Arendal, in Norway, the latter of which 
have also been called Moroxite, are generally very simple ; in 
most cases, the combinations P. P-i- go, and P. Il-f- oo. P-{- oo, 
represented in figs. 13. and 14. The surface of these crystals 
is commonly very smooth and even, sometimes the edges are 
rounded, particularly in the varieties from Arendal. 
Among the numerous varieties found in the mines near Ehren- 
friedersdorf, in Saxony, one most deserving our attention is that re- 
presented in Pig. 15., of which the original may be seen in the col- 
lection of DrRohatsch at Prey berg. Besides the limits of the series 
of rhombohedrons and isosceles six-sided pyramids, R —00 (P) 
R -f- 00 (e) and P -f- oo (ilf), it contains three dirhombohedrons 
a!, and d, and three isosceles six-sided pyramids, r, x and ; 
the relations of which to one another it will be easy to find from 
the observed parallelism of their edges of combination. From 
the preceding combinations, particularly Fig. 5., s is known to 
be 2 (R), and x to be P, or that isosceles six-sided pyramid, 
whose terminal edges are inclined to the principal axis under the 
same angle, as those of the rhombohedron R, produced by en- 
larging the alternating I’aces marked s in the figure. The edges 
of combination between s and x are parallel to the terminal 
edges of both these forms, The faces of the dirhombohedron a 
appear with parallel edges of combination in the place of the 
terminal edges of the pyramid x^ they would hence likewise pro- 
duce parallel edges of combination, if applied to tlie terminal 
edges of the rhombohedron R, and the whole form produced by 
enlarging all the faces marked «, will consequently be 2 (R — 1), 
its angles * = 145° 38' ; 72° 25'. The edges of combination 
* According to the formuloe for the dirhombohedron, quoted above, only — 
must be substituted for a. 
