1887, | NEW YORK ACADEMY OF SCIENCES. 37 
Chemical and Mechanical Analysis. 
In the analysis of this stone, the usual chemical methods 
were employed, which it is not necessary to describe in detail. 
A considerable part of the stone was found to be insoluble in 
acid, and it was desirable to ascertain the proportion in this of 
the insoluble minerals (quartz, mica, etc.), whose identification 
had already been made by the microscopical study of the thin 
sections. For this purpose, a considerable amount (over 9 
grammes) of insoluble residue was first obtained from a large 
amount of dolomyte. The constituents in this (which of course 
contained no dolomite or calcite) were separated, through their 
different densities, by the usual method of mechanical analysis. 
The fine powder was stirred in the concentrated solution of 
cadmium borotungstate, until the heaviest mineral, pyrite (sp. 
gr. 5.0) had separated; on proper dilution the phlogopite (sp. 
gr. 2.8) and afterwards the quartz (sp. gr. 2.6) successively fell; 
and the small amount of carbon (sp. gr. 2.1) was left floating, 
and was separated by filtration, 
The analysis of the stone is presented below in two forms: 
in the first with the actual chemical constituents, separated by 
chemical means; in the second, with the actual mineral constit- 
uents of the stone, as obtained by calculation and by mechani- 
cal analysis. In the latter statement, the first constituent, 
dolomite, contains a little iron, manganese, and a trace of 
nickel. 
Analysis. 
Ing Olmble;LesidU Greece sees eiiceiees 15.41 
ITIVE Ng searciaty care, re ckedersPecs aie ashe ter eae ore ele 27.33 
Miaomesi das setae sere cise awe ctsteinreleis ie oevane 17.89 
HerrousiOxIdesysc eee eee LSI OO ae .70 
HErHICOXIGek acne ois oe aes, Ieee taints 04 
Mancanousioxdd ease eeicecneinieee « eles 
INTCKENORIGE I eel Sieiasccusrcia cies ateare . trace 
BANIURTYA TIN Ay reper craters oro tc se) ioe eke Siero .22 
WarbonicGiacidhencne vise acon sake cine ae 37.80 
Siliciesacias(Soluble)sevasaee eee eee .20 
Sulphuniciacidh vac. saeco oe ae eee 21 
BhHOsphoriciacidy.tyc sey eerie. ake seme 10 
IMOISEUTER ase to einer Le acre nea trace 
3.00.42 
or 
Dolomitere ae tice a sees ciocgabo ag deo. 67.93 
Wal eitepc prion cci ory cere sist esi crticernietone LARS 
HE OMHOCIEC Shee eh ic oie eee aes 84 
Phlogopite...... BS OO DO Oe Sate Eee 9.33 
OuaTtzeeerias otae oe Veco ohe ake ict tis eaco te 8.16 
