A NATURAL SYSTEM IN MINERALOGY, 73 
mineralogist, to yield very important results for the science of mineralogy. His experi- 
ments appear, as will be seen, to show close relations between this solvent action of the 
acid and the condensation or atomic volume of the species, as calculated in the accom- 
panying tables of the various tribes of silicates. 
TABLE X.— Prniroips. 








SPECIES. FORMULA. ie D V 
Jollyte.- - -|(mal,si,)o, + 2aq - (m = fey.gMg.4) | 15.75 | 2.61 | 6.03 
Fahlunite.- - | (m,al,si;)o) + 1laq- (m= fejmg3) - | 16.03 | 2.70 | 5.93 
Hsmarkite. -|(mjaljsi;joy2aq - - - - - - | 15.89)... 
Bravaisite. -| (k,aljsig)o; + 4aq - - > - - - | 15.82]... 
Hygrophilite. | (kal.sij)o,, F3aq - - - - - - |16.33/...]... 
Pinite. =: - -| (kjal,sij.)0,+3aq- - - - - - | 16.25; 2.80} 5.08 
A Cossaite. - -| (na,al8i,.)0.. + 2aq - - - - - 15.91 | 2.89 | 5.50 

§ 12. It is not enough to have arranged mineral species in orders and tribes. It is 
evident that there are relations between certain species in any given tribe which serve 
to bring them together into families and genera, but which, with our present trivial nom- 
enclature, can be but very imperfectly indicated. The various tourmalines, with different 
quantivalent ratios, will constitute, at least, one genus, with several species; and the 
great tribe of the Protoperphylloids includes many genera and more than one family. In 
Tagze XI. — PERADAMANTOIDS. 








SPECIES. FORMULA. 12 D V x | 
Dumortierite. - | (al,si,)o; - - 16:33 | 3:36 | 4:86 | C 
Andalusite. - - | (ali,jo, - - 16-20 |: 3:55 | 4-85 | O 
Fibrolite. - - - |(alsi,)o, - - | 16:20 | 3:35 | 4:83 | © 
Topaz. - - - -|(alsi,)ofl, - | 18°40] 3-65 | 5-04 | O 
Cyanite. - - -|(al,si,)o, - - | 16:20 | 3°66] 4:42 A 
Bucholzite. - - | (al,sij)o, - - | 16°00! 3-24] 4-90 | © 
Xenclite. - - -|(aljsi;jog - - | 16°00] 3:58 | 4-46.) C 
Warthita, -- © = |/(aljsi,jo,, + Jaq|15°60)| <--- || .--- | © 
Lyncurite. - - |(zrsi,)o, - - | 22°75 | 4:05 | 5:61 T 
Malacone.- - - | (2r,si,)o,+Jaq| 2122 | 4-00 | 5-30 | T 
Zircon. - - + -|(zrsi,)o, = - | 22:75 |, 4:70 | 4-84 | T 
Auerbachite.- - | (zr,si,Jo; - - | 21:20 | 4-06] 5-2 | T 
Anthosiderite. - | (fisi,)o, +#aq | 17°21 | 3:00 | 5:73 ? 
| 


the Protoperspathoid tribe, the large family of the feldspathides takes in several genera, 
one of them the true feldspars, embracing the albite-anorthite series, and perhaps paran- 
thite and iolite ; and another, the adularia series, with a less condensation, comprehending 
orthoclase, microcline and hyalophane. In this same tribe, besides the scapolite genus, 
which takes in the meionite-marialite series, is a group of related species, including 
Sec. III., 1886. 10. 
