...
Location:
...
Shore
...
of
...
the
...
Wouri
...
river
...
(25
...
km
...
from
...
the
...
Atlantic
...
ocean),
...
City
...
of
...
Douala
...
(long.
...
9
...
42';
...
Lat.
...
4
...
3'),
...
Cameroon.
...
Provenance:
...
Mix
...
of
...
(1)
...
?volcanic
...
source
...
rich
...
in
...
quartz
...
with
...
(2)
...
?basaltic
...
gas-rich
...
lava;
...
also,
...
(3)
...
some
...
arid-climate
...
components.
...
...
Composition:
...
Dominant typically blocky, highly angular transparent and clear, occasionally slightly yellowish quartz (volcanic or high-grade metamorphic provenance ?). Significant (~5%) component of fresh black glassy bubbly lava (resembling pumice), few wind-abraded grains with desert varnish; very few grains of chlorite/epidote minerals.
Interesting incongruent composition. Traces of well rounded quartz grains and recent plant seeds.
...
Texture:
...
Coarse-grained (cU, median ca. 1000µ); poorly sorted, angular.