The word "Lapilli" is often misspelled due to its uncommon phonetic sound. The IPA phonetic transcription for Lapilli is /ləˈpɪli/. The first syllable is pronounced as "luh" with a short u sound, followed by "pilli" with a long i sound. The double L in the word is pronounced with a quick, flicking sound made in the back of the throat. Lapilli refers to small volcanic fragments that measure about 2 to 64 millimeters in diameter. By understanding its correct spelling and pronunciation, Lapilli can now be used more appropriately in geologic contexts.
Lapilli are small, rounded, and typically pyroclastic fragments that are ejected during volcanic eruptions. They are classified as pyroclastic materials, which refer to any solid fragments that are erupted during volcanic activity.
These lapilli can vary in size, typically ranging from 2 to 64 mm in diameter. They are formed when molten rock fragments, known as magma or lava, are rapidly ejected into the atmosphere and cool down very quickly. As a result, the magma solidifies into small, rounded shapes before falling back to the ground.
The surface of lapilli can be rough or smooth, depending on the degree of their fragmentation and cooling. The most common composition for lapilli is basaltic or andesitic, containing minerals like olivine, pyroxene, and plagioclase feldspar.
Lapilli are often found in volcanic deposits, forming layers within pyroclastic rocks or tuffs. Their accumulation can create a distinctive texture in volcanic deposits called lapilli tuff, which consists of lapilli-sized particles cemented together by volcanic ash.
Due to their relatively small size, lapilli are not as dangerous as larger pyroclastic materials (such as volcanic bombs or blocks) during volcanic eruptions. However, they can still pose hazards to human safety and infrastructure if they rain down heavily during explosive eruptions. Lapilli can cause minor damage to buildings, obstruct transportation routes, and pose respiratory issues if inhaled in large quantities. Therefore, understanding the behavior and characteristics of lapilli is essential for volcanic hazard assessment and mitigation.
Fragments of lava thrown out by volcanoes and cooled into rounded drops in falling.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word lapilli comes from Latin, specifically from the diminutive form of the word lapis, which means stone or pebble. In Latin, lapillus referred to small stones or little pebbles. The plural form of lapillus is lapilli.