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What minerals cannot be determined by a streak plate?
Minerals that cannot be determined by a streak plate typically include those that are harder than the streak plate itself, such as diamonds and corundum, as they will not leave a streak. Additionally, minerals that are non-metallic and have a very light color or are transparent may not produce a visible streak. Furthermore, minerals that are powdery or have a very fine texture might not yield reliable streak results.
What happens when the gas in magma is unable to escape?
If the gas cannot escape, such as when the magma solidifies underground, then the gasses become part of the minerals within the igneous rock. Since the main gas in most magma is water vapor, this effect will manifest mostly as hydrous minerals such as amphibole and mica.
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.
Can most minerals cannot be broken?
Yes. Most minerals can be cleaved or fractured.
Can high pressure can change an igneous rock into a sedimentary rock?
No, high pressure alone cannot change an igneous rock into sedimentary rock; however, the reverse is true. High pressure can change sedimentary rock into igneous rock.
What igneous rock is aphanitic texture?
These are igneous rocks that are too fine textured to an extent that there mineral grains or crystalline texture cannot be seen or distinguished with the necked or unaided eyes. They appear or occur as a whole single massive crystalline extrusive body of Igneous origin. Example is Obsidian.
What is an aphanite?
An aphanite is a specific type of dark igneous rock with grain fine enough that individual crystals cannot be seen by the naked eye.
Definition of non-metallic minerals?
Non-metallic minerals are minerals that do not contain metals in their chemical composition. They are typically found in sedimentary and igneous rocks and are used in construction, manufacturing, and agriculture. Examples include limestone, gypsum, clay, and quartz.
Define implied texture?
Implied texture is texture that cannot be felt. For example: crayon rubbings
What happens when the gas in magma is unable to escape?
If the gas cannot escape, such as when the magma solidifies underground, then the gasses become part of the minerals within the igneous rock. Since the main gas in most magma is water vapor, this effect will manifest mostly as hydrous minerals such as amphibole and mica.
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.
Which minerals cannot scratch any minerals by itself?
Diamond is the hardest naturally occurring mineral and can scratch all other minerals. Talc is the softest of minerals and cannot scratch any other mineral.
What igneous rock has no visible crystals as a result of rapid cooling?
Obsidian rocks are cooled very fast, and you cannot see the crystals in them.
Why igneous rocks cannot contain fossils?
It's due to the high temperature of magma. Igneous rock is formed from the cooling of lava and magma.
How do igneous rock feel?
A rocks texture cannot be the sole determining factor in rock type identification. If the grains are loosely cemented and come off in your hands when you vigorously rub the rock, there's a good chance it is sedimentary, however.
Are minerals food?
Minerals are nutrients, which are part of food. These are what help nourish the body, but the body cannot survive on minerals alone.
Vitamins and minerals cannot be what in our body?
"synthesized"
