0
Pegmatite is a type of igneous rock that can have two different grain sizes of the same mineral present. This is due to the slow cooling process of the magma, allowing for the growth of large crystals (phenocrysts) within a finer-grained matrix.
It could be a porphyritic igneous rock, or a sedimentary rock composed of different clast sizes like conglomerate or breccia.
One sedimentary rock with large and small grains is called a conglomerate. One igneous rock with large and small grains is called a porphyry.
Add your answer:
Earn +20 pts
What are some non examples of texture in rocks?
Texture in rocks is not the same as color or shape. Texture refers to the size, shape, and arrangement of mineral grains or crystals within a rock, while color refers to the outward appearance of the rock. Similarly, shape in rocks refers to their physical form or structure, and not the internal arrangement of mineral grains which defines texture.
Why can two rocks look very different even though they have the same minerals?
The texture, shape, and color of rocks can vary based on factors like the environment they formed in, their history of weathering and erosion, and the presence of other minerals or impurities. This can result in rocks with the same minerals looking different due to variations in their physical characteristics.
How do two igneous rocks have the same mineral composition but different textures?
Igneous rocks can have the same mineral composition but different textures due to variations in cooling rate and location of formation. For example, a rock that cools quickly on the Earth's surface will have a fine-grained texture, while a rock that cools slowly beneath the surface will have a coarse-grained texture. These different cooling rates can result in the same mineral composition but different textures in igneous rocks.
Is it possible for two igneous rocks to have the same mineral constituents but different names?
Yes, it is possible for two igneous rocks to have the same mineral constituents but different names. This can occur if the rocks have formed under different conditions such as depth of burial, cooling rates, or chemical compositions, which can lead to different textures, structures, and overall classification.
Why are the minerals considered to be the building blocks of rocks?
Minerals are the building blocks of rocks because rocks are composed of mineral grains. These mineral grains are tightly packed together through various geologic processes to form a rock. The type and arrangement of these minerals determine the characteristics of the rock, such as its color, hardness, and texture.
Why do igneous rocks that have the same composition sometimes have different sizes of mineral grains?
This is as a result of difference in the rate of cooling of the Igneous rocks.
Can two igneous rocks be made of the same minerals but have different names?
Yes. The grain texture also matters. For example, basalt and gabbro have the same mineral composition, but basalt, which forms on the surface, has microscopic grains while gabbro, which forms underground, has larger mineral grains.
Why are rocks not the same?
Because different rocks are formed by different processes and made up of different mineral assemblages.
What are some non examples of texture in rocks?
Texture in rocks is not the same as color or shape. Texture refers to the size, shape, and arrangement of mineral grains or crystals within a rock, while color refers to the outward appearance of the rock. Similarly, shape in rocks refers to their physical form or structure, and not the internal arrangement of mineral grains which defines texture.
Why can two rocks look very different even though they have the same minerals?
The texture, shape, and color of rocks can vary based on factors like the environment they formed in, their history of weathering and erosion, and the presence of other minerals or impurities. This can result in rocks with the same minerals looking different due to variations in their physical characteristics.
How do two igneous rocks have the same mineral composition but different textures?
Igneous rocks can have the same mineral composition but different textures due to variations in cooling rate and location of formation. For example, a rock that cools quickly on the Earth's surface will have a fine-grained texture, while a rock that cools slowly beneath the surface will have a coarse-grained texture. These different cooling rates can result in the same mineral composition but different textures in igneous rocks.
Is it possible for two igneous rocks to have the same mineral constituents but different names?
Yes, it is possible for two igneous rocks to have the same mineral constituents but different names. This can occur if the rocks have formed under different conditions such as depth of burial, cooling rates, or chemical compositions, which can lead to different textures, structures, and overall classification.
Is a rock and a mineral the same?
No. Rocks are combinations of minerals.
Metamorphic rocks with the same mineral assemblages belong to the same?
metamorphic facies. This indicates that these rocks formed under similar pressure and temperature conditions despite coming from different locations.
Is a rock and a mineral the same thing?
No. Rocks are combinations of minerals.
What is the least reliable way to classify a mineral?
color for instance real gold and fools gold is the same color but 2 different rocks
Is the cleavage for a mineral always the same for that mineral?
Yes, all different samples of that mineral will have the same cleavage.
