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.
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.
Volcanic eruption resulting from collapse of the roof of a batholith; the volcanic rocks grade into parent plutonic rocks.
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.
An organic reef which has been formed largely of algal remains and in which algae are or were the main lime-secreting organisms.
The area where the bulk of the snow contributing to an avalanche was originally deposited.
A sinkhole or other natural opening which resembles a well extending below the water table and from which groundwater can be withdrawn.
See upper-level anticyclone.