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What is the darkest igneous rock?
Obsidian is black volcanic glass, and is extremely dark.
Dark fine grainmed volcanic rock consisting of plagioclase feldspar?
andesite
What is the difference between volcanic bombs cinders and ash?
Vocanic dust is Fine vocanic ash that is under .063 millimeters. Vocanic ash is tiny parts of rock or glass, its size is under 2 millimeters. Volcanic bombs are magma that bursts out of the volcano and harden in the air. There size is over 64 millimeters. Vocanic cinders are dark glassy fragments that are produced by gas in the vocano.
What volcanic eruption caused the world to go dark?
No volcanic eruption in human history has darkened the entire world. But about 535 AD a volcano at Krakatoa erupted so violently it may have darkened the sky around the world to an extent that it caused famines and threw Europe into the Dark Ages (they are not called the Dark Ages because the sky was dark, rather it was considered to be a period of intellectual darkness).
Why is chromium important?
Chromium is useful in glass-making because it is one of the most powerful of all coloring agents used in the glassmaking industry and is used in the production of dark green glass.
Name given to dark volcanic glass?
Obsidian.
What is the darkest igneous rock?
Obsidian is black volcanic glass, and is extremely dark.
What is the geology of obsidian?
Obsidian is volcanic glass. unusually amongst the various rocks and minerals it is made of one single piece with no individual grains. this is due to it being cooled extremly rapidly from a magma (most commonly into a cool sea.) the dark colour is caused by heavy amounts of included minerals.
What is ocean crust made of?
The oceanic crust is made out of basalts - (lava-hardened Iron/Magnesium Silicate mixtures which solidified rapidly).
What is dark volcanic rock?
Obsidian
Where does obsidian come from?
Obsidian is molten silica (read sand) which has cooled rapidly after a volcanic eruption into brittle glass and is the reason why it chips easily into blades. Iron and magnesium give obsidian its dark color.
Which type of volcanic material appear dark grey?
andesite
What is dark glassy volcanic rock called?
obsidian
Does water evaporate faster in a dark glass or clear glass?
It depends on how much light is shining on the glass. If there is a lot, then the water in the dark glass will evaporate faster because the temperature will be higher. If there is no light, then it does not matter.
Dark fine grainmed volcanic rock consisting of plagioclase feldspar?
andesite
What color is obsidian?
Obsidian is volcanic glass and is found in several colours including - black, grey, dark green, red, yellow and pink. mostly black It is also very sharp; it can be used to make knives
What color is volcanic rock?
Volcanic rocks are usually dark grey to black in colour - however some (like pumice) may be light grey.
