Explanation
In rock, quartz and potassium feldspar (usually microcline or perthite) alternate with each other and coexist regularly. These two minerals are interconnected into wedge-shaped crystals, resembling wedge-shaped characters, hence their name. It is formed by quartze and alkaline feldspar under the condition of coalescence, but it may also be related to metasomatism or solid solution exsolution. It is common in the marginal zone of granite and pegmatite. The larger ones are visible to the naked eye. What can only be observed under polarized light microscopy is called "microscope". See crackle glaze for lamellar glaze.
Classification
Natural materials and products -> Mineral materials