EEE Si Bi ee Nea ste eiaba Sevan | a, tte ee cone ee eae Ieee te ee ee ea ee 
S. L. Penfield—Chemical Composition of Triphylite. 227 
occurs at that ag rents with spodumene. This un- 
_ altered triphylite is very rare, but the specimen, a portion of 
| whi 
ch was used for Pete ioe was br ght and lustrous, with the 
distinct cleavages, and all the ysical characters of the original 
mineral. e following — give additional proof of its 
being quite free from altera 
(1.) ‘Triphylite from Notwidh; Mass.; color greyish green, 
specific gravity =3 534. 
4 i Il. Mean. Atomic relation. 
= PO, 44:72 44°80 44°16 be “630 
FeO 26°40 26°40 26°40 Fe °366 
MnO 17°87 17°80 17°84 Mn (Jee 
CaO 16 32 "24 Ca 004 ( 
MgO “49 “45 “AT Mg 012 
Li,O 9°37 9°34 9°36 Li *622 t —-632 
Na,O 32 38 "35 Na “010 
H,O 53 30 42 
— ee _— Li, ‘S11 ' —-316 
99°86 99°80 99°84 Nag 005 | 
The analyses of the Bavarian triphylite which have been 
published do not agree very satisfactorily, and have left some 
doubt in regard to the true composition of the mineral. Wit 
a view to settling this point I have also analyzed an authentic 
specimen from Bodenmais, Bavaria. This was furnished to me 
by Professor Brush ; he ha 1d received it from Dr. Hugo Miiller, 
who had himself collected it at the locality. It was quite pure 
and entirely free from any traces of alteration. The results of 
the analysis are given below; it will bs seen that it has afforded 
an exceptionally large percentage 0 
(2.) Triphylite from Bodenmais; nen light blue, specific 
gravity =3549. 
) Il. n. Atomic relation. 
P.O; 43°16 43°19 43-18 P . 
FeO 36°23 36-20 36°21 Fe “503 
MnO 8-95 8-96 8:96 Mn 126 | __ exo 
CaO 08 12 10 Ca 002 [— 
MgO "84 “83 83 Mg 021 
Li,0 8°14 8-15 8°15 Li B44) inne 
Na,O ‘31 22 26 Na 008 
aie “92 “82 pl i a 
angue . "84 - 2 if oe 
se Pip: aa peters Naz 004 § ~ 276 
99°45 99°33 99°39 
lite has been found. In connection with these it is interesting 
to note the mineral lithiophilite from Branchville, Connecticut, 
recently described by Messrs. Brush and Dana* and shown 
em to be analogous to sl ag in nee on. This min- 
eral was first analyzed by Mr. H. L. Wells of the Sheffield 
* This Journal, IT], xvi, a August, 1878. 
