PETRIFACTIONS, no. PhytolitHus. 
351 
the pieces of which are found or carious or perforated by the 
Teredo, converted in charcoal, with or without the bark, and 
often fo perfeft as to diftinguiih the kind, as Oak, Afh, Fir, &c. 
a. Mafmoreous and often filled with fpar. 
In Ireland, Brandenburg, Bohemia, Hungary, Saxony, Ger- 
many, &c. 
b. In fwineftone. 
Near Boll in Wirtemburg- 
c. In Gypfum. 
In Bohemia and Piedmont, 
d. In Alumina. 
Near Creux in lower Hungary. 
e. In Silica. 
In England, Ireland at Loughneagh, Italy, Switzerland, Hun- 
gary, Germany, Saxony, Audria, &c. 
f. In Agate. 
Holzilein. Karji. Lejke miner, t. p. 136. 
In Siberia, Hungary, and Saxbtty, more or lefs opakc, break- 
ing into coarfe fplinters or indeterminate fragments, a lit-' 
tie Alining, taking a fine pohAi, fibrous internally, of a 
conchoidal texture, variegated, fpotfed or llriate, blackifii 
or fmoke-colour, fometimes red, ochraceous or green. 
g. In Opal. 
Hoizopal. Karjlen Lejkt miner. \.p.\-yo. 
In upper Hungary, hardiAi, opake or nearly fo, breaking into 
indeterminate fragments or long fplinters, feparating into 
eruAs, generally a little Alining, nioftly variegated with, 
White, greyiAi, brow'n, or ochraceous and hyacinthine in- 
alternate Areaks. 
h. In SandAone. 
In Silefia, Bohemia, Germany, Sec. 
i. In Alumina. 
Sometimes forming large Arata, in England, Sweden, Saxony, 
Bohemia, Auliria, Piedmont, &c. 
k. Combined with fulphate ok iron. 
In Prujjta in the Arata fuperincumbent on amber, and neat 
Boll in Wirtemhurg. 
l . Combined with fulphate of copper. 
Near Herreng’und in lower Hungary. 
m. Bituminous. 
Frequentlv forming ent're fubterraneous woods in various 
p rts of England and Ireland, particularly in L'ncolnjhirt, 
in Rufsin, Sweden, Denmark, France, Spam, Holland, Flan- 
ders, Germany, Prujtia in Arata fiipcrincumtient on amber, 
Saxony, Bohemia, Aujiria, Italy, and Switzerland. 
