0
because of the history that has been put into them such as a hawiian finding a rock and taking it home cleaning it and polishing it.
or there were items thron into a volcano before eruption such as dimonds then when the volcanos erupted the magma and items were mixed it a hardend together
What else can I help you with?
Some igneous rocks such as obsidian are glassy because they?
cool rapidly
What is the luster of igneous rock?
i think that igneous and metamorphic rocks uses luster because maybe they have it in them
What igneous rocks does not have a glassy texture?
Granite, diorite, and gabbro are examples of igneous rocks that do not have a glassy texture. These rocks are formed from slowly cooled magma underground, allowing time for crystals to grow, giving them a coarse-grained appearance.
Do Glassy igneous rocks form when magma cools so slowly that mineral crystals cannot grow?
No, glassy igneous rocks form when magma cools so quickly that mineral crystals do not have time to form. This rapid cooling prevents the atoms in the magma from arranging themselves into a crystalline structure, resulting in an amorphous, glassy texture.
Is glassy igneous rocks intrusive or extrusive?
Glassy igneous rocks are typically extrusive, meaning they form at the Earth's surface from rapidly cooling lava. Intrusive igneous rocks form underground from slowly cooling magma and generally do not have a glassy texture.
Some igneous rocks such as obsidian are glassy because they?
cool rapidly
What are rocks that have a glassy texture called?
Obsidian
What is the luster of igneous rock?
i think that igneous and metamorphic rocks uses luster because maybe they have it in them
Some extrusive igneous rocks such as obsidian are glassy because they are what?
They cool to quickly for crystals to form.
What igneous rocks does not have a glassy texture?
Granite, diorite, and gabbro are examples of igneous rocks that do not have a glassy texture. These rocks are formed from slowly cooled magma underground, allowing time for crystals to grow, giving them a coarse-grained appearance.
Do Glassy igneous rocks form when magma cools so slowly that mineral crystals cannot grow?
No, glassy igneous rocks form when magma cools so quickly that mineral crystals do not have time to form. This rapid cooling prevents the atoms in the magma from arranging themselves into a crystalline structure, resulting in an amorphous, glassy texture.
Why is a igneous rock appear smooth and glassy?
Some igneous rocks are very smooth and glassy (obsidian) while others have a very rough texture, such as the rocks used on the bottom of a propane gas grill. They are all formed from lava, but the glassy rocks cooled so fast that crystals did not have a chance to form. The rougher rocks cooled more slowly, allowing larger crystals to form--Slower cooling = larger crystals = rougher texture.
Which igneous rock cools the fastest glassy aphanitc pegmatic and porphyritic?
Glassy igneous rocks cool the fastest. The most likely had more nucleation. Pegmatic cooled the slowest, which is why its crystals are larger than 1 cm. Phaneritic is the next slowest in cooling. Porphyritic has slow then rapid cooling, while aphanitic igneous rocks also have rapid cooling.
Is glassy igneous rocks intrusive or extrusive?
Glassy igneous rocks are typically extrusive, meaning they form at the Earth's surface from rapidly cooling lava. Intrusive igneous rocks form underground from slowly cooling magma and generally do not have a glassy texture.
What are igneous rocks formed at the earths surface called?
Igneous rocks formed at the Earth's surface are called extrusive igneous rocks. They form when magma cools and solidifies quickly on the Earth's surface, resulting in fine-grained or glassy textures. Examples include basalt and rhyolite.
Do Glassy igneous rocks form when magma cools too fast for mineral grains to grow?
yes
Are igneous rocks smooth?
They may be smooth and others may be rough. Smoothness/roughness is not a defining characteristic for igneous rocks.
