10 H. How on Natro-boro-calcite and another Borate 
BOs CaQ HO NaO KO SO, NaCl Sand 
Peru, M62). TSC0 SOO i ites = pees, ease oan ey eee 
auecaoy, STIS " 086 40g: ok ce ee. Varn ae eee 
Peru, 49°50 15°90 2580 8&8 bees SUH wei> Soe lee 
Peru, 4950 1770 2600 88 pee. de nee ed eee Se 
Peru, 4546 1432 .... 822 051 110 265 082 Dick. 
Peru, 43°70 1311 85°67 667 0-83 npey Ramm.¢ 
Peru, 47°25 «1598 25-46 988 .... O45 .... 0-98 Andersona 
ance aR oe 13°95 38439 836 .... 1:29 ~~ 0-04 H. How 6 
14°20. S449: 721. ix 
(a) Dana’s ane 4th Ed., > P. 894. (6) Liebig und opps Jahrb. 1849, = hg A 
this Jour., Sept., 1857, 7, Third Supp. to Dana’s Min., p. 6. (d) Proc Proc. Phil. S 
Ww, 2. 
In the account of the analysis by Anderson the quantities of 
soda and SO, as above given are reversed, but from the conclusion 
drawn by the author this is mad tate a mistake. _ As regards the 
all but the first two analyses, and in my examination, as stated 
at the time, the mineral was washed for ioe séeonid analysis with 
wis bag till all sulphuric acid was removed. 
m the preceding data the iowiis formulas have been 
dodased: 
CaO 2B0,+6H Hesse 
NaO 2BO’ +2020, 3B0,+10HO Ulex, 
NaO 2BO,-+-2CaO, 3B0,+-15HO H. How, 
NaO 2B0,+2(CaO 2BO,)+18HO Rammelsberg, 
all referring to a mineral found in rounded masses, rb of 
interwoven fibres, opa ae, snow-white and of a silky lus 
he mineral to w I would now draw attention was  foutd 
in the ame quarry as ‘ie eat loner tae at a distance of about 100 
ower level, and also associated with 
here, according to sec quarrymen, in narrow seams at the line of 
ead, insoluble in water, soluble in 
found, or very soon after sare: brought home, it lost by al 
to air, Water=18°36 per cent, 
