J. D. Dana on the Feldspar group of minerals, 403 
The oxygen ratios, and the ratios of the non-alkaline to the 
alkaline portion of the ay pee a are as follows 
; # R+R Si Non-alk. : All. 
| ~ Meionite : a 2 1 i! 1 IO: fod 
q Mizzonite : 22: 5} be 18 be ag 
arialite 22 2.6 kg 
The non-alkaline pe mene is lime; the alkaline i is soda wa 
some potash, The excess of silica i in Mizzonite and Marialite 
may be attributable to impurity or alteration as has been usual 
(and to some extent with reason) in the Scapolite division of 
the Scapolite group. But the crystals are glassy and show no 
evidence of change or mixture. They are found exclusively in 
volcanic or allied igneous rocks. 
. The Scapolite section of the Sagi group affords 
<sette are cr ‘aie intermediate. But Scapolite undergoes 
80 easy alteration through the action of carbonated or alkaline 
waters that we have reason for doubts jeden many of the results 
of analyses.* Yet, in spite of the uncertainties from this 
source the principle sta stated comes out sennly to view. In fact 
it has already been remarked by Rammelsberg in his Mineral 
Chemie (p. 716) that « “the Scapolites which are poorest in sil- 
ica are richest in lime; and as the ae diminishes, the pro- 
portion of soda (or potash) increases,” - 
) Looking first ~ the soem Fhe divisions, we find the follow- 
ing as the average ratios afforded by the best analyses.f 
* Seapolite —— ea —_— through carbonated wate 
for the soda; and poe ough solutions of an iron salt, which i ‘ 
Vom Rath goer as trae epi agalmatoli th rphs, aft 
Scapolite. mica, 
epidote, oxyd of i iron ens. to 16 p. ¢.) was pee and part of the ~ lo 
agalmatolite, potash (7 p. ¢.) displaced 
part of the oi uate gro “ hrcsoeny Similar altered acapales ti have been descri- 
“raid eeu aT is rather probable that the trace of potash found in many scapo- 
val as eae paneee set aie di in the table on p. — But it contains 
55 . i bt, an altered min 
a ce. of potash, and is, with hardly a fad oo Sees ean to the action 
Jponate of soda, 6 to 8 p. c. of 
lime; and it may be that 
me gata ace. 
The name: ernerii lite to Norw 
Arendal) by 4 by a Andtadn | in the fie kane uti poreiok ak Scherer s J., Os 35, "38, 1800) wea 
olite is needed as a name for. the —_ later 
ng groups of species, 
_ tte is‘applied to one of the two most prominent sections; Exel the other, 
it including g the v ariety so-called; while Haiiy’s name = changed to pa- 
ox tare of the = — 
