Golden Mica

This is a group of almost hexaëdral laminæ, but very confused, and as it were compressed with layers of Sandy Quartz, &c. intervening. Its lustre is often so truly metallic that it is like thin plates or squamæ of Gold, nor could we represent it without metallic aid.—It is perhaps chiefly coloured by Iron Ochre.

This specimen was brought from Aberdeen, and partakes somewhat of the nature of Gneiss.