Glauconite is a mineral of marine origin and found in sedimentary deposits of various kinds. It is the green mineral characteristic of the greensand of the chalk and other formations. It is similar to a mineral called celadonite, it is used in the textile, sugar, and brewing industries; as a colouring agent and in the manufacture of fertilizers. It has the formulae (K,Na)(Al, Fe,Mg)2(Al,Si) 4O10(OH)2 and a relative hardness of 2.
Monthly Archives: April 2009
kossava
A cold, very squally wind descending from the east or southeast in the region of the Danube ”Iron Gate” through the Carpathians, continuing westward over Belgrade, then spreading northward to the Rumanian and Hungarian borderlands and southward as far as Nish.
areal eruption
Volcanic eruption resulting from collapse of the roof of a batholith; the volcanic rocks grade into parent plutonic rocks.
coagulation
See agglomeration.
veering
1. In international usage, a change in wind direction in a clockwise sense (for example, south to southwest to west) in either hemisphere of the earth. 2. According to widespread usage among United States meteorologists, a change in wind direction in a clockwise sense in the Northern Hemisphere, counterclockwise in the Southern Hemisphere.
algal reef
An organic reef which has been formed largely of algal remains and in which algae are or were the main lime-secreting organisms.
accumulation zone
The area where the bulk of the snow contributing to an avalanche was originally deposited.
geosynclinal couple
See orthogeosyncline.
natural well
A sinkhole or other natural opening which resembles a well extending below the water table and from which groundwater can be withdrawn.
high-level anticyclone
See upper-level anticyclone.