Whether the granite is invading the rock
Look at the granite again
The granite composition is quartz feldspar mica
With the naked eye can see the obvious three of the crystal ~
In line with the characteristics of crystal coarse ~ so it is invasive rock
And the magma emitted from the surface is rapidly reduced due to the rapid cooling pressure
Crystals do not have plenty of time to grow to form cryptorphic or vitreous
Submerged refers to the crystal particles very small naked eye is difficult to distinguish between vitreous is simply no crystal chaos.
In addition, due to the pressure to reduce the dissolved gas in the magma will be released
Forming a stomatal structure basalt can often be seen on ~
And some other features, such as ripple structures
The magmatic rocks are divided into ejected rocks and intrusive rocks according to whether the magma is ejected
The magma of the intrusive rock is not sprayed to the surface with plenty of cooldown
The formation of the rock has a coarse crystal grain characteristics - even a few tens of meters large giant crystal called pegmatite ~
Granite pegmatite is a kind of long-sighted ~
