Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
23-
metal physics of
showy Bice, Sp
part of Mr. Smyth?
pleats
many directions
fracture cleavage
breaking in slowly spread
planes which is not
completely penetrative
axial plane cleavage
where friction is high over
grain area it is
axial plane cleav