SIMPLE MINERALS, 
11. Common Jasper.— It occurs in veins of con- 
siderable thickness in clay slate in Upper Egypt* 
Brown Egyptian Jas'per,* — This beautiful 
mineral, which is peculiar to Africa, occurs loose, 
and very abundantly in the sandy desert between 
Cairo and Suez : also in other parts of Lower 
Egypt, where it is said to occur^ imbedded in a 
species of conglomerate. 
13. Prehnite, — This beautiful species of the 
zeolite family is found in veins that traverse 
granite, in the country of the Namaquas, to the 
north of the Cape of Good Hope. 
14. ActynoUte. — It occurs in Alpine valleys in 
Upper Egypt, along with epidote. 
15. Hornblende, — It is abundantly imbedded 
in the syenite and greenstone of Upper Egypt. 
16. Amianthus, — Beautiful blue and yellow 
coloured amianthus are found near Hardcastle, on 
the Orange river, in Southern Africa. Specimens 
of these and other minerals, collected in Africa^ 
are now in the Museum of the University of Edin- 
burgh, presented by Mr Campbell, the Missionary 
traveller. I have much pleasure in mentioning 
this circumstance, as it shews that these gentle- 
men may execute all their important duties^ 
while, at the same time, by their observations 
and collections, they contribute to the advance-* 
ment of Natural History. 
17« Calcareous alabaster^ or calcareous sinter^ 
55 
