They are common constituents of microcrystalline igneous rocks, and often occur as inclusions in larger crystals of other substances.
Inclusions of other minerals are specially frequent and conspicuous in crystals of quartz, and crystals of calcite may contain as much as 60% of included sand.
Inclusions of foreign matter, accidentally caught up during growth, are frequently present in crystals.
None of the inclusions in the diamond gives any clue to its origin; diamond itself has been found as an inclusion, as have also black specks of some carbonaceous materials.
Some of the fibrousinclusions were identified by H.
Sidenote: Inclusions defined} In the new Rules and Regulations of the Copyright Office promulgated as approved by the Librarian of Congress in 1910 as Bulletin No.
It is to the reflection and interference of light from these minute inclusions that the peculiar bronzy sheen or "schiller" of the mineral is due.
Inclusions within a few inches of the border fall into a separate class, since they show in general but trifling alteration and preserve their original cleavage plains.
Inclusions or xenoliths of shale are common, however, ten and fifteen miles distant, though they are prominent features in a belt only a few miles wide.
They contain inclusionsof the magma and are often eroded.
They are as a rule corroded and are penetrated by numerous fissures, whilst they contain a considerable amount of altered magma-inclusions with sometimes other alteration products.
They are sometimes twinned and may be eroded and contain inclusions of the magma.
They contain inclusions of the magma and give lamellar extinctions of andesine labradorite (20°-30°).
Numerous points coloured by iron oxide occur in the section, and minute dust-like inclusions abound, which are doubtless water-pores.
They contain usually abundant inclusions of the magma sometimes arranged zone-wise, and are frequently eroded.
Plagioclase crystals occur macroscopically in the glass; they are much eroded and contain numerous large inclusions both of the clear isotropic glass and of its palagonitised form.
They often contain abundant inclusions of the magma sometimes arranged schiller-fashion, and are frequently eroded.
They often contain abundant magma-inclusions and give lamellar extinctions of 15° to 25° (basic andesine).
Both the quartz and orthoclase contain dust inclusions and crystallites, while the evidences of shearing and crushing are abundant.
A white rock having a peculiar mottled appearance due to the inclusions of decomposing biotite which project from the surrounding mass of calcite.
The labradorite contains inclusions of rutile and biotite and has a well-developed wedge structure and cross fracture due to the pressure and shearing which it has undergone.
These inclusions may be simply small cavities, sometimes so numerous as to make the stone nearly black, or they may be particles of other minerals, such as chlorite, hematite or carbonaceous matter.
Even otherwise transparent Diamond often contains inclusions which cloud and interrupt its clearness.
Hair-line seams are caused by small non-metallic inclusionsin the steel.
There is every reason to believe that these inclusions are in the greater majority of cases manganese sulphide.
Both islands are interesting geologically from the occurrence there of a remarkable breccia containing inclusions of Devonian Limestone, and also from the existence of some rare types of dyke rock.
In the case of Mount Royal, however, inclusions of Lower Devonian limestone are found in the intruded rock, so that the intrusions forming the mountain are later than Lower Devonian time.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "inclusions" in a variety of sentences. We hope that you will now be able to make sentences using this word.
