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.
Is diabase the hardest rock?
The strongest rock in the world is diabase, followed closely by other fine-grained igneous rocks and quartzite. Diabase is strongest in compression, tension, and shear stress. If mineral hardness is the determining factor of strength then diamond is technically the strongest rock in the world.
Is diabase a rock or a mineral?
Diabase is a common rock type. It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow. The term “microgabbro” is sometimes used to refer to such rocks.
How do I know if I have diabase?
Diabase is best identified in thin section with a petrographic microscope, with x-ray diffraction, or with other instruments that can identify the component minerals and their relative abundances.
What is diabase dike?
Diabase (/ˈdaɪ. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass).
What texture is diabase?
ophytic texture
Diabase have a ophytic texture, with slender to broad plagioclase laths wrapped or molded by anhedral to subhedral pyroxene, tha larger plates of witch may also enclose the plagioclase.
Is diabase a volcanic?
Diabase (/ˈdaɪ. əˌbeɪs/), also called dolerite (/ˈdɒl. əˌraɪt/) or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro.
What is the difference between basalt and diabase?
Diabase is actually a variety of gabbro which consists mainly of labradorite feldspar, augite, magnetite, and olivine. 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 color is diabase?
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 diabase rock used for?
Diabase is crushed and used as a construction aggregate for road beds, buildings, railroad beds (rail ballast), and within dams and levees. Diabase can be cut for use as headstones and memorials; the base of the Marine Corps War Memorial is made of black diabase “granite” (a commercial term, not actual granite).
What does a diabase look like?
diabase, also called Dolerite, fine- to medium-grained, dark gray to black intrusive igneous rock. Chemically and mineralogically, diabase closely resembles the volcanic rock basalt, but it is somewhat coarser and contains glass. With increase in grain size, diabase may pass into gabbro.
What is diabase texture?
Diabase have a ophytic texture, with slender to broad plagioclase laths wrapped or molded by anhedral to subhedral pyroxene, tha larger plates of witch may also enclose the plagioclase.
What is the difference between gabbro and diabase?
It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is a common rock type. It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow.
What type of igneous rock is diabase?
Diabase Diabase (dolerite) is a dark-colored igneous rock. It is compositionally equivalent to gabbro and basalt but texturally between them. Diabase is a common rock type.
What type of rock is didiabase?
Diabase is a common rock type. It occurs mostly in shallow intrusions (dikes and sills) of basaltic composition. It grades to basalt when it solidifies rapidly and to gabbro when more time is given to the crystals to grow. The term “microgabbro” is sometimes used to refer to such rocks.
What is the difference between gabbro and microgabbro?
Petrology. Gabbro is generally coarse grained, with crystals in the size range of 1 mm or greater. Finer grained equivalents of gabbro are called diabase (also known as dolerite ), although the term microgabbro is often used when extra descriptiveness is desired. Gabbro may be extremely coarse grained to pegmatitic,…
