W. 8. Tyler on Spartaite of Breithaupt. 175 
Analysis gives, 
nO; . = 3 : 13°79 
Ca O, ‘ : ; 43°65 }as 1:4:5, 
O?, . os ° ° 42°01 
which leads to (1Mn O0+2CaO) CO? as the formula of the 
species. 
Calculated, Obtained. 
Mn O, Rey! ig | eae . 13°79 
4Ca O, 43°49 , 43°65 
ak. nik (RE Ra ee ne ae 
100°00 99°45” 
This is the same mineral as that referred to by Rammelsberg, 
pee 209 of his Handbuch der Mineralchemie, as analyzed by 
enzsch and Richter with the following results: 
By Jenzsch. By Richter. 
Carbonic acid, ‘ 40°97 . . 44:04 
i jie oe OS eae eee 
Maptiesia, 600 9 0" OOF See ae 
Protox. ir 0°38 "13 
Proiox. manganese, +. je } 
Oxyd of zinc, . 5 OR. : ere 
; * 0°32 eS 
98°35 100°30 
Rammelsberg gives the following as an approximative formula, 
based on the foregoing: i 
oCad+ ye tO. 
Regarding the magnesia, iron and zinc as accidental, I have 
only to add, respecting the species, that in color it is generally a 
very pale reddish white, and where associated with dysluite and 
Jeffersonite (hedenbergite) of a bluish gray tint, sometimes (from 
Partial decomposition) yellowish or reddish brown. It cleaves 
with facility; and the rhombohedrons thus obtained afford, both 
by the common and the reflective goniometer, angles rather 
over than under 106°. ‘The planes are striated parallel to their 
‘onger diagonals. With borax before the blowpipe the character- 
istic manganese reaction is speedily produced. 
, rhis mineral had for years been recognized in my cabinet asa 
double carbonate of lime and manganese, and called by me cal- 
ame isso nearly s mous with Spartalite, (given in 1852 
Sy Brooke and Miller, to the red oxyd rf zinc), I would suggest 
_ Me substitution of calcimangite for it, as an appellation that may 
__ Stve to prevent confusion, the more especially as the two mine 
a tals occur together, 
oe Amherst College, Dec. 14, 1864. 
