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Aerodynamically shaped australite, its button shape caused by ablation of molten glass in the atmosphere Tektite about 3cm long, mass 11 grams Though the meteorite impact theory of tektite formation is widely accepted, there has been considerable controversy about their origin in the past.
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). Diabase can also be cut for use as ornamental stone for countertops, facing stone on buildings, and paving. [ 21 ]
The biotites in the exterior aureole become more iron- and titanium-rich as they near contact with the Lilesville Granite. In the inner part of the exterior aureole, potassium-rich feldspar begins to appear as it gets closer to the granite. This part of the exterior aureole is a darker gray matrix composed of quartz, feldspar, and biotite.
Monzogranite – Biotite granite rocks that are considered to be the final fractionation product of magma – A silica-undersaturated granite with <5% normative quartz; Monzonite – Igneous intrusive rock with low quartz and equal plagioclase and alkali feldspar – a plutonic rock with <5% normative quartz
Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. [5] Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. [6]
The opposite is anhedral (also known as xenomorphic or allotriomorphic), which describes rock with a microstructure composed of mineral grains that have no well-formed crystal faces or cross-section shape in thin section. Anhedral crystal growth occurs in a competitive environment with no free space for the formation of crystal faces.
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