A related texture is amygdaloidal in which the volcanic rock, usually basalt or andesite, has cavities, or vesicles, that are filled with secondary minerals, such as zeolites, calcite, quartz, or …

Apr 23, 2023 · Vesicles form when gas is trapped in the magma during volcanic eruptions and then solidifies as the lava cools and solidifies. Vesicular basalt often has a porous and …

Basalt is usually gray, brown, or black, and often contains features like vesicles and phenocrysts. The vesicles in basalt are the remnants of gas bubbles that became trapped in the lava as it …

Basalt is a fine-grained mafic igneous rock. It is commonly vesicular and aphanitic. When porphyritic, it often has either olivine or plagioclase phenocrysts.

Nov 8, 2023 · Basalt is the most common type of volcanic rock found on Earth. It is typically dark in color and is commonly vesicular, and has either an aphanitic or porphyritic texture. Basalt …

Vesicles range in shape from spherical to elongated and in size from ~1mm to more than 1 cm. Basalts are most commonly vesicular. The drop in pressure that a magma experiences as it …

Basalt is typically composed of plagioclase feldspar, pyroxene, and olivine. It can be found in a variety of textures, including aphanitic (fine-grained), porphyritic (with large crystals embedded …

This vesicular or cellular specimen was produced when gas expanded as the lava was extruded to the surface. The fact that the lava was still fluid and moving can be seen by the fact the …

Sample 10072 is a fine-grained vesicular basalt that crystallised 3.6 billion years ago (measured by Ar/Ar, Rb/Sr and Sm/Nd methods). Its texture is best described as sub-ophitic and …

Aug 17, 2023 · Texture: Fine-grained or aphanitic with grain sizes less than 1/16 mm but may be porphyritic, vesicular, subophitic, ophitic, or amygdaloidal. Colors: Dark gray, dark green-gray, …