
          for optical purposes. But it was cut at right angles and not
parallel to the axis. I have found [?] transparent [?]
[?] but never more than 1/8 of an inch thick. They are all
split by the immense pressure which has acted on the [?]
Should I find any [?] share them with you with pleasure.

My opinion of Jackson's chlorophyllite is that it is dichroite.
I have seen some of it quite blue, but the great difficulty is that
it is ruined with other matters mechanically. [Josiah Dwight] Whitney who originally
analyzed it & who is now gone to study under [Jöns Jakob] Berzelius spent
much time on it & always found  a minute portion of
phosphate of aluminum in it, but I tried & found it extremely
difficult to separate it mechanically from the talc & other 
substances with which it is mixed. [?] the crystallisation [added: however] is
in such perfect hexahedric prisms that I do not see how it
can be called compressed. I believe I told you I fade found the tin
at Chesterfield orginically discovered by Mohs in a specimen sent
to him. I only found 5 or 6 minute obtuse octohedrons one
bright enough for measurement. A paper from me was read
on it at the Geological meetings here last April. One crystal I gave
to Dr. [Edward] Hitchcock who in return presented me with a piece of tin ore
he found at Goshen, so that I hae now tin from 3 localities in the
US. One [?] I gave to Jackson & one to Silliman. Have you
heard that antimony has been discovered at Carmel in Maine?
I have one small specimen when I get more I will send you
some if you wish. I believe it is in quantity enough for cooking.
The consumption of this metal is large in the US & of course
it is now all imported. I have lately recd a parcel
        