Amygdule - Wikipedia Rocks containing amygdules can be described as amygdaloidal The word is derived from the Latin word amygdala, meaning "almond tree", and the Greek word αμυγδαλή, meaning "almond" – reflecting the typical shape of an infilled vesicle
What Are Amygdales and Amygdaloidal Rocks | Earth Know Amygdala means almonds since these mineral-filled vesicles resemble almonds Rocks or lavas with amygdales are said to be amygdaloidal Common examples are basalt, basaltic andesite, and andesite However, they can occur in other rocks, too, including rhyolite
ALEX STREKEISEN-Amygdales- Amygdules or amygdales form when the gas bubbles or vesicles are infilled with a number of different secondary mineral, depending on the groundwater chemistry and the physical conditions underground The word is derived from the Latin ("amygdala") words for almond, reflecting the typical shape of an infilled vesicle
AMYGDALOIDAL Definition Meaning - Merriam-Webster The meaning of AMYGDALOIDAL is of, being, or containing small cavities in igneous rock that are filled with deposits of different minerals (such as chalcedony)
Vesicular and Amygdaloidal Textures - University of Pittsburgh Amygdaloids are simply vesicles that have been filled in with a secondary mineral long after the flow cooled Such secondary minerals are commonly white: quartz, calcite, or zeolite (A secondary mineral is one that formed after the rock originally formed ) This is a fine example of a vesicular basalt
Amygdaloidal Agate : Properties, Formation, Uses - Geology Science Amygdaloidal agate is a specific type of agate that forms within the voids or cavities of volcanic rocks These voids, often created by gas bubbles in the lava, are called "amygdales" or "vesicles "
Amygdaloidal Minerals - Michigan Technological University Using a canoe or small boat, watershoes and plenty of time, walk the shore and watch for veins and amygdaloids Observe the interiors of basalt flows where vesicle cylinders, pegmatites, joints and veins may expose these distinctive minerals (see diagram)
Amygdaloidal Agate - Geology In Amygdaloidal agate is a variety of agate-like material that forms within volcanic vesicles or cavities It is characterized by the presence of amygdules filled with secondary minerals, set within a matrix of cryptocrystalline quartz
Dwarves Earth Treasures: Agates and Thundereggs - Sailor Energy The amygdaloidal agates were formed by filling in the gas cavities within the dark colored basalt and andesite lava rocks Since the basalt rocks tend to be good source of impurities acting like coloring agents, the agates are well known for their great variety of colors and shapes that cannot be rivaled by any other minerals as demonstrated by the fact that they had been widely used in many