Lasikerrokset

Lasikerrokset, meaning "glass layers" in Finnish, refers to a geological phenomenon observed in certain types of volcanic rock, particularly in the Skaftafell Nature Reserve in Iceland. This phenomenon is characterized by thin, glassy layers that form on the surface of volcanic rocks as they cool. The rapid cooling process traps volcanic gases within the molten rock, creating a glassy, often vesicular, texture. These layers can vary in thickness and appearance, sometimes exhibiting iridescent qualities due to light refraction.

The formation of lasikerrokset is closely tied to the specific mineral composition of the lava and the rate at which it solidifies. Underwater volcanic eruptions, or eruptions that occur in contact with water, can also contribute to the formation of glassy textures, often referred to as hyaloclastite. While not a widespread geological term, "lasikerrokset" is specifically used in the context of Icelandic geology to describe these visually striking glassy coatings on volcanic rocks, offering insights into the cooling dynamics of past eruptions. Their presence can also indicate specific environmental conditions during the eruption.