sulphuric acid all the silicates except garnet are dissolved, which with perovskite forms the larger part of the residue.
The
specific gravity of the rock was determined by the use of Klein's
cadmium solution and Westphal's balance, and is somewhat less than the
true specific gravity.
Two varieties were analysed ] : —
I. The least decomposed rock, with few shale enclosures.
II. The more decomposed rock, with many shale enclosures (diamantiferous).