What is a dolerite rock?
Dolerite is an igneous rock, that is, rock initially molten and injected as a fluid into older sedimentary rocks. The magma, of quartz tholeiite composition, was emplaced as a liquid which rose upwards through the basement rocks into older sedimentary rocks of the Parmeener Supergroup.
What type of rock is diabase?
Diabase is an intrusive igneous rock with the same mineral composition as basalt.
What does dolerite look like?
diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap.
What is pumice texture?
Vesicular
Pumice
| Type | Igneous Rock |
|---|---|
| Texture | Vesicular |
| Origin | Extrusive/Volcanic |
| Chemical Composition | Felsic |
| Color | White |
What is the difference between diabase and gabbro?
Diabase is actually a variety of gabbro which consists mainly of labradorite feldspar, augite, magnetite, and olivine. The grain size of diabase is on the smaller side. Diabase and gabbro have the same general mineral composition as basalt, but they have a larger grain size.
What is diabase dike?
Diabase dikes. A dike is a sheet-like body of igneous rock intruded as molten magma that cuts across the older rocks. In Wake County and surrounding areas, most diabase dikes are sheets that dip very steeply and trend close to north-south (Figure 1).
How are diabase formed?
Diabase is a fine-grained igneous rock that would have formed when molten rock material cooled rapidly on or near the surface of the Earth.
What does diabase look like?
What is the hardness of dolerite?
2.93-3.05
| hardness (MOH) | weight* (kg/l) | |
|---|---|---|
| Syenite | 2.6-2.8 | |
| Diorite | 5-6 | 2.75-2.87 |
| Basalt | 6-8 | 2.8-3.3 |
| Dolerite | 2.93-3.05 |
How is dolerite formed?
Dolerite sills and dykes are intrusions of igneous rock formed by molten magma from the Earth’s mantle, which forced its way to the surface through cracks in the rock layers. Cracks may form when there is tension in the Earth’s surface, e.g. the break-up of Gondwanaland.
How does pumice get its texture?
Pumice Textures and Characteristics. Due to the presence of numerous vesicles, pumice’s texture is called a vesicular texture. It is a type of volcanic texture characterized by the presence of cavities in the surface and the interior of the rock, similar to how Swiss cheese appears.
What is the difference between basalt and diabase?
Diabase and gabbro have the same general mineral composition as basalt, but they have a larger grain size. Basalt is identical to diabase and gabbro, but is very fine-grained. Basalt is from a melt that cooled very rapidly- in other words, on the surface of the earth or in the ocean.
What is the difference between basalt diabase and gabbro?
What is musical texture?
Musical Texture refers to how different layers of a piece of music are combined to produce the overall sound. There are four music textures that you need About Contact Login 0 items – $0.00
What is a heterophonic texture?
Heterophony is a less common musical texture, but it is useful to understand it. Heterophonic music is where a melody is varied by an additional voice/part at the same time as the original melody is being played. Heterophonic textures can be found in a wide range of music from jazz, folk music to the gamelan from Indonesia.
What is crystal texture?
Said of the texture of an igneous rock composed entirely of crystals, i.e., having no glassy part. Also, said of a rock with such a texture. Click here to see list of references, authorities, sources and geographical terms as used in this glossary.
What is polyphonic texture?
The definition of polyphonic texture comes from the Greek (poly-phonic), literally meaning “many sounds”. It describes music where several parts or voices are combined togethercontrapuntally or in counterpoint.