70 T. STERRY HUNT: SUPPLEMENT TO 
tioned. I then suggested, in order to test the correctness of this view, comparisons between 
the adamantoids, epidote and spodumene, on the one hand, and the spathoids, iolite and 
petalite, on the other; predicting that these latter would, like the feldspars, be attacked, 
and the former would resist the action of fluorhydric acid. The correctness of this prevision 
was confirmed by the results of Mr. Mackintosh’s experiments, communicated to me April 
Taste VII.— ProTOPERSPATHOIDS. 
+ 
| SPECIES. | FORMULA. P D V x 
Melilite. - - | (caymsiz)o, - (m= al4fit) - - | 20.46 | 2.10 | 6.60 
Eudialyte. - | (myzr,Si,,)0,3 - (m=—na,.;ca1.:fe,0) 20.30 | 3.00 | 6.76 
Wohlerite.- - Fos ores 
Humboldtilite. | (cajal.si;)oj = - - - - - - | 19.80} 2.90 | 6.65 








ee 
KR. 
C. 
[Le 
Ilvaite. - - - | (m,f,si;)o,, - (m = feicat)- - | 22.83 | 3.71] 6.15] O. 
Gehlenite.- = | (ca. -9Sij-3)03-3 - (m = al?fif) | 19.83 | 3.06 | 6.48 | T, 
Sarcolite - - | (ca,alsi,jo, - - - - - - -|18.75|2.93| 6.40) T, 
Milarite. - - | (myal,sig)oy) - (QM —=Caysko) - | 16.88 | 2.59 | 6.51] O. 
Barylite. - - | (ba,al,si,)oy. - - - - - - | 25.75) 4.03/ 6.38] 9 
Meionite. - - | (caaljsij,)o.,- - - - - - - | 17.80) 2.74) 6.49) T. 
Wernerite. - | (myalySijg)09- - = = - - - |17.41|2.70 | 6.44] T. 
Ekebergite. - | (m,alsigdon - - - - - - -|17.42|2.74]|6.32| T 
Mizzonite. - | (myal,Si,)o3.- - - - - - -|17.20| 2.62) 6.56) T. 
Dipyre.- - - | (myalgsiny)oy,- - - - - - - | 16.89} 2.64) 6.89) T. 
Marialite. - - | (myalySigg)oyy- - - - - - - | 16.43} 2.57) 6.89) T. 
Sodalite. - - | (nayalsi,,)o,cl,- - - - - - |19.88} 2.80) 8.28) I. 
Nosite. - - - | (najal,si,)o,;+4masjo, - - - | 20.28} 2.40] 8.25] 1, 
Hauyne. - - | (na,alysi,o,+3ea,s,0, - - - | 21.60] 2.50| 8.64] 1. 
Ibaraki, [PS = oO See 20) ECS DT 
Leucite. - - | (kyalsis)o.- - - - - - - |18.16/ 2.56] 7.09) I. 
Hyalophane. - | m,aljsiz)o,, - (m—=bazk}) - - | 19.89) 2.80) 6.92) ©, 
Orthoclase. = | (k,al,siy)og - = - - - - - | 17.37) 2.54) 6.83] C. 
Microcline. - | (kyaljsi,,)o,;- - - - - - - | 17.37 | 2.54 | 6.83] A. 
Nephelite.- - | (najaljsi,;)oy,; - - - - - - | 17-58) 2.66) 6.60| x. 
Paranthite. - | (cajal,siyjo, - - - - - - - | 17.37) 2.75/ 6.31) 'T, 
Eucryptite. - | (lialsijo; - - - - - - - | 15.75| 2.67|5.93| H. 
Anorthite.- - | (cajalsiyjo, - - - - - - - | 17.87) 2.75) 6.52) A. 
Barsowite. - |(caal;si)o, - - - - - - - | 17.11) 2.73) 6.27) 9 
Labradorite. - | (m,aljsig)o;)- (m—caïnai) - 16.97 | 2.70 | 6.28] A. 
Andesite. - - |(m,alssi)o,,-(m—cainai) - | 16.70) 2.68) 6.23) A. 
Oligoclase. - | (m,al,si,)o,;-(m—=nagcat) - | 16.63 | 2.65) 6.27) A. 
Albite. - - - | (majal,si,.)oj, - - = - - - | 16.87) 2.62) 6.24) A. 
Iolite. - - - | (m,al,si;)o,- (m= mg#fe}) - | 16.81) 2.67| 6.29) H. 
2.42] 6.33] C 



Poldlite. == (also ee ue elite | | 
9th, since which time he has greatly extended his enquiries in this direction. He finds that 
while not only the pectolitoids and the zeolitoids, but various spathoids, such as wollas- 
tonite, the feldspars and scapolites, as well as iolite and petalite (together with titanite, 
jefferisite and protovermiculite) are more or less readily corroded by the fluorhydric acid, 
the adamantoids, pyroxene (diopside) enstatite, danburite, garnet, epidote, zoisite, axinite, 

