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Obsidian, actually a volcanic glass, has no crystalline structure due to its quick solidification.
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Which minerals lack an ordered atomic arrangement or crystal structure?
Mineraloids are mineral like substances that do not have a crystalline structure. Mercury is an example.
What is the difference between plutonic rocks and volcanic rocks?
Both are igneous rocks, but whereas volcanic rocks are formed from cooling lava on the surface, plutonic rocks are formed from cooling magma below the surface. So plutonic rock is an igneous intrusive rock, while volcanic rock is extrusive.
What kind of metamorphic rocks are massive and lack banding?
Marble and quartzite are two examples of metamorphic rocks that lack banding and are massive. The lack of banding may indicate that the metamorphism may be due to a greater factor of heat than of pressure.
Why do some rocks have bigger crystals than others?
Larger crystal size is generally associated with longer cooling times, because large crystals take a long time to form. For this reason, intrusive (underground) igneous rocks have larger crystals than extrucive (above ground) rocks, due to the lack of insulation, and hence faster cooling, at the surface.
What does the lack of sedimentary rocks represents the passage of time mean?
Absence of sedimentary rocks = passage of time because over time, sediment breaks down and forms with the earth (land, sea, mountains)
Which minerals lack an ordered atomic arrangement or crystal structure?
Mineraloids are mineral like substances that do not have a crystalline structure. Mercury is an example.
What is the difference between plutonic rocks and volcanic rocks?
Both are igneous rocks, but whereas volcanic rocks are formed from cooling lava on the surface, plutonic rocks are formed from cooling magma below the surface. So plutonic rock is an igneous intrusive rock, while volcanic rock is extrusive.
Which kind of metamorphic rocks are massiv and lack banding?
nonfoliated rocks
What Mineral alignment in a metamorphic rock usually gives the rock a porphyritic texture?
A porphyritic texture can be a feature of igneous rocks, but 'porphyritic' is not used to describe metamorphic rock texture. Metamorphic rocks can be foliated or non-foliated, terms used to describe mineral alignment or banding, or the lack thereof.
Are sedimentary rocks classified tofoliated sedimentary rocks?
Metamorphic rocks are classified by foliation or lack there of, not sedimentary rocks. They are classified into Clastic Sedimentary, and Chemical Sedimentary.
Do viruses lack cell structure?
yes
What specific type of rock can NOT be formed from minerals?
There are a couple examples. Coal is a rock, but it is organic and so does not contain minerals. Obsidian and pumice are both varieties of volcanic glass. Since they lack a crystal structure, they are not composed of minerals
Which is a characteristic of all nonfoliated metamorphic rocks?
Lack of banding
Would sedimentary rocks be found on the moon?
No sedimentary rocks are found yet. The reason is moon is lack of atmosphere.
How can you tell the difference between an igneous rock and a metamorphic rock?
Igneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rock . Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground. Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? The rocks are exposed to great heat and pressure from depth of burial or exposure to tectonic forces, and this causes them to change. The change is reflected in the recrystallization of certain mineral crystals, or even the disappearance of some minerals and the appearance of new minerals. Metamorphic rock often displays foliation, in which the minerals are aligned in bands or thin layers perpendicular to the force that was applied in their metamorphosis. Igneous rocks do not display layering.
What kind of metamorphic rocks are massive and lack banding?
Marble and quartzite are two examples of metamorphic rocks that lack banding and are massive. The lack of banding may indicate that the metamorphism may be due to a greater factor of heat than of pressure.
What is the texture term for metamorphic rocks which lack banding?
Non-foliated
