Note 102 — Chapter XXXI · THE PERMIAN VOLCANOES OF SCOTLAND
Reading edition
Occasionally the crystals can be matched in some lava-form rock of the same volcanic area; but many of them have no such counterparts. See vol. i. p. 62 and note.
Reading edition
Occasionally the crystals can be matched in some lava-form rock of the same volcanic area; but many of them have no such counterparts. See vol. i. p. 62 and note.