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It is usually potassium feldspar, either microcline or orthoclase.

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What are rocks called that are square and have blocky crystal?

Rocks that are square and have blocky crystals are typically referred to as "granite" or "granitoid" rocks. These rocks are composed mainly of quartz, feldspar, and mica, and their blocky crystals result from the slow cooling of magma deep within the Earth's crust. The term can also refer to the specific crystal form known as "cubic" or "blocky," which is characteristic of certain minerals like halite or pyrite.


What rocks are composed of minerals that form with blocky crystals shapes?

Igneous rocks, such as granite, are composed of minerals that form blocky crystal shapes. The cooling process of magma allows these blocky crystals to crystallize and grow within the rock. This results in the characteristic interlocking crystal structure seen in igneous rocks.


What is the crystal structure of moonstone?

Moonstone belongs to the feldspar group and has a monoclinic crystal structure. It typically exhibits a prismatic, tabular, or blocky appearance, often with fine striations. Moonstone's crystal structure is characterized by its layers of alternating orthoclase and albite feldspar minerals, which create the mesmerizing adularescence or "moon-like" sheen when light reflects off its surface.


Do Orthoclase and plagioclase feldspars have quite different forms of cleavage?

Orthoclase feldspar typically exhibits two cleavage planes at right angles to each other, forming blocky or prismatic shapes. Plagioclase feldspar, on the other hand, shows two cleavages at nearly 90 degrees but often also has a third cleavage at a slightly different angle, resulting in more varied forms.


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