Texture of Sandstone

Sandstone is a sedimentary rock composed of sand-sized grains of mineral, rock, or organic material. The texture of sandstone refers to the size, shape, and arrangement of the individual grains that make up the rock. The texture of sandstone can be classified into four main types:

1. Granular Crystalline Texture: This type of texture is characterized by the presence of interlocking crystals that are visible to the naked eye. The individual grains are tightly packed together, giving the rock a granular appearance. This texture is common in sandstones that have been subjected to high pressure and temperature.

2. Porphyritic Texture: This type of texture is characterized by the presence of larger crystals, called phenocrysts, that are embedded in a finer-grained matrix. This texture is common in sandstones that have undergone partial melting and recrystallization.

3. Conglomerate Texture: This type of texture is characterized by the presence of rounded clasts, or rock fragments, that are cemented together by a finer-grained matrix. This texture is common in sandstones that have been transported and deposited by rivers or other flowing water.

4. Vesicular Texture: This type of texture is characterized by the presence of small cavities, or vesicles, that are formed by the escape of gas bubbles during the solidification of the rock. This texture is rare in sandstones, but can occur in certain types of volcanic sandstones.

Therefore, the correct answer is option D, granular crystalline texture.