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Pumice is an extrusive igneous rock (meaning that it is formed when lava breaks through the earth's crust and hardens on contact with the air). This also means that deposits are found very close to the Earth's surface, and is mined using the drift mine method, in which an open pit is dug. Pumice is removed from the pit as ore, which is a large piece of rock containing the mineral, and is tehn sifted and separated.
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How is pumice classified?
Pumice is classified as a felsic, glassy, highly vesicular, extrusive igneous rock.
What is the Fracture type of pumice?
The fracture type of the Pumice rock is either jagged or splintery. The Pumice has both fracture and cleavage type.
Give at least 5 economic uses of rocks?
Ore rocks, those containing an economically feasible extrable amount of a mineral are widely mined across the world in the production of metals such as iron, steel, aluminum, lead, copper, titanium, zinc, gold, silver, and tin. The number of products created from these ore rocks is limitless.
Poor quality coal that could not be used at the time it was mined?
Lignite used/mined in in 1850-1950 (estimated)
Which term describes a material that is full of tiny connected air spaces?
a rock that is full of tiny, connected air spaces is PERMEABLE
What rocks float?
Vessicular Rocks. Eg Scoria and Pumice.
Can pumice rocks float to the Florida coast?
Pumice rocks have been known to float across oceans.
Does pumice have calcite?
No. Pumice is a volcanic rock. Volcanic rocks do not contain calcite.
Rocks that are mined because they contian useful substances are called what?
ores are rocks that are mined
What type of rocks are pumice obsidian and granite?
Igneous rocks
How is pumice economically important?
It provides employment for those who gather volcanic rocks and profits for those who convert those rocks to pumice.
Is pumice and obsidian exaples of minerals?
No. Pumice and obsidian are rocks composed mostly of glass.
Name 4 kinds of igneous rocks?
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
What are pumice rocks used for?
typically, Pumice rocks are used to scrape the rough areas of feet so that they are smooth
Are Scoria and Pumice pyroclastic rocks?
yes
Why do pumice rocks float?
it has holes in it and has kelfrigis
Is pumice used to polish other rocks?
NO
