Review of Dana’s Mineralogy. 877 
thorities and foreign languages” for the purpose in question, can 
fully appreciate the thankless nature of the labor. The number 
of species retained is about four hundred and eighty. By care- 
ful comparison of analyses, and by researches undertaken ex- 
pressly for the work, some of the dark points of American min- 
eralogy have been cleared up, and many species turned over to 
our table of synonyms on a following page. 
= _This part of the work is well illustrated by figures, about sev- 
: “enty of which are new in this edition. The author has added 
many original figures of American species. We have space only 
to extract a few notices where the matter is new, and particu- 
larly interesting to American readers. We follow the order of 
the treatise. 
“Borate oF Lime. Borocalcius obliquus. 
(4. A. Hayes, private communication to the author.) 
“Primary form, an obtuse oblique rhombic prism ; Fig. 10. 
M:M=97° 30’ and 82° 30’—82° 36’, (‘Teschema- t 
cher.) Secondary form, the annexed figure; M:é 
=147° 30’, (Teschemacher.) Also in masses having 
a globular form, consisting of interwoven fibres. 
“Crystals colorless and transparent. Fibrous masses 
opaque, snow-white, silky, and have a peculiar odor. 
“ Composition, according to Mr. A. A. Hayes, a 
Hydrous borate of lime ; the exact constitution has not 
yet been determined. In warm water the fibrous 
Masses expand and form a consistent paste with more 
than eight times their volume. Mr. Hayes states that 
this variety contains more water than the crystals. 
“Obs. This salt occurs quite abundantly on the dry plains near 
Iquique, 8. A., associated with magnesian alum, (Pickeringite of Hayes,) 
Where it was obtained by Mr. J. H. Blake. The crystals are some- 
times a quarter of an inch long.” (p. 243.) 
“ CuLoropHyLuite. Stylus foliaceus. 
(*Esmarkite, Erdmann, Jahresb. 1841, p. 174. Chlorophyllite, 
Jackson, Ist An. Geol. Rep. of New Hampshire, p- 152. Pinite.) 
“Occurs in six and twelve-sided prisms. Highly foliated parallel 
to the base of the prism ; sometimes also a prismatic cleavage more or 
less distinct. 
_._ “H. of basal plane 1-5—2; the lateral edges will scratch apatite. 
_ G.=2-705, Jackson ; 2°709, Erdunpntin Lustre of basal plane, pearly ; 
Vol. xtv1, No. 2.—Jan.-March, 1844. 48 
