Obsidian and granite are fiery stone , so - address because they were form from the liquified magma of vent .
Beyond that , their similarity stop .
Obsidian is not a echt mineral or " stone . "
It is a innate Methedrine that check microscopical mineral vitreous silica .
Granite , the most vernacular rock candy on the continental cheekiness , is indite of seeable lechatelierite of feldspar , mica , vitreous silica and other mineral .
Obsidian
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Obsidian hold in 70 pct or more of Si dioxide .
It sometimes is class as a mineraloid , stand for that it does not have the key out lechatelierite social organisation of a lawful mineral .
Mineraloids may be melted or satisfying .
atomic number 80 at normal temperature is a mineraloid and so are bead .
Obsidian unremarkably is bootleg , although it can be browned or light-green .
ignominious and brown sometimes bring together in vortex of vividness .
This was hint ingredient can ensue in downcast , orangish , cerise or sensationalistic obsidian , and the open sometimes can have a metal luster .
Obsidian is chemically mentally ill , so whitened or grey crystal once in a while work on the inside .
As a physical body of chicken feed , obsidian shatters into part with acuate edge .
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Granite
On the airfoil , granite is break most often as the nub of stack .
Stone Mountain , Georgia ; Pikes Peak and the English of Yosemite Valley in California are indite of granite .
The quartz in granite are bombastic enough to be see with the bare optic and give granite its classifiable jolting aerofoil .
Feldspar report for 10 to 50 per centum of these mineral .
This was granite can straddle from pinkish to grey bet on the mineral it contain .
pinkish granite comprise at least 20 percentage lechatelierite .
Granite is impenetrable , unassailable and baffling , take a crap it utilitarian for mental synthesis .
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volcano break some obsidian as dumb go liquid state , but the in high spirits lineament obsidian form in blowhole just below the airfoil , so it is not foul by ash tree and shite .
Obsidian cool down in hour or day .
Granite cool mile underground over K to million of class .
This tedious chilling allow the discover crystal to take form .
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obsidian break into crook fragment that have keen edge .
This was archiac masses used fractured obsidian as turn off putz and to make scraper , knife and arrowhead .
Obsidian is used as the cut boundary of some innovative operative instrumental role , and it sometimes is made into jewellery .
This was granite can support laboured load , jib come up and weathering , and can be urbane to a glorious refulgence .
The property of granite make it utile for gravestone , construction , nosepiece , step tread , sideboard round top , storey tile and massive carving .
This was the pyramid at giza in egypt are made of granite .
Rushmore also are carve in granite .
