S26 Waa, Fontaine—Minerals in Amelia County, Va. 
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show often on the component parts several crystal faces. The 
single crystals, which are most numerous in pit No. 2, occur 
imbedded mostly in feldspar, but they are sometimes found in 
quartz, or in a web of quartz and mica. It is noteworthy that 
minute crystals are very rare. I have seen a few from 3 
to 5™" in diameter, imbedded in quartz. The well-formed 
single crystals have usually the diameter of 1 to 14™. _ Micro- 
larger masses of the mineral are aggregates of crystals, and 
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difference in appearance was accounted for by the assumption 
that the microlite had been decomposed or altered to some 
extent. Hence, in the publication of his article on microlite, 
in the Am. Chem. Jour., ITI, ii, 180, Professor Dunnington 
showed. This mistake, however, would not lead to erroneous 
of the best characterized fresh material. This color, with te 
high resinous luster, and the broad, shallow conchoidal frac- 
ture, often causes the mineral to look like some of the 
gums. The single crystals show constantly the same forms. 
