No
No. Granite cools from magma deep underground. Volcanic glass cools quickly at or near the surface.
No, glass is made from melted silicon dioxide.
Granite is a rock, whereas obsidian is a type of glass formed by cooling lava.
Concrete, tile, marble. granite, glass.
Obsidian is a felsic glass. At depth, it will crystallize to form granite. On the other hand it turns into perlite on reacting with water. At high grade it recrystallizes to form felsic glass.
Manufacturers typically advise not to, because the direct heat from the glass cooktop can cause the top, porcelain layer of the granite ware to melt. I wouldn't risk it. +++ You won't melt porcelain at cooking temperatures - start at 1000ºC - but certainly risk cracking it.
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The only granite used was for decoration purposes. The buildings were made primarily out of Concrete, Steel, with thick glass windows.
Granite cookware may not be suitable for glass cooktops because it can be too heavy and may scratch or damage the surface. Additionally, the uneven bottom of some granite cookware can lead to poor heat distribution, resulting in uneven cooking. It's essential to use cookware specifically designed for glass cooktops to ensure safety and optimal performance.
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Three types of igneous rocks are basalt, granite, and obsidian. Basalt is a dark-colored fine-grained rock, granite is a light-colored coarse-grained rock, and obsidian is a natural glass formed from rapidly cooled lava.
Granite is a durable and hard material, making it resistant to cracking and chipping, but it can still be prone to damage from excessive force or impacts. It is less prone to breakage compared to materials like glass or ceramic. Properly cared for and maintained, granite can remain in good condition for many years.