Kiillekivi

Kiillekivi, also known as "killer stone" in English, is a type of sedimentary rock that is composed primarily of calcium carbonate, often in the form of the mineral aragonite. It is notable for its distinctive appearance, which includes a dark, often black or brown, matrix with light-colored, often white or cream, bands or layers. These bands are typically composed of calcite, which is another form of calcium carbonate.

Kiillekivi is found in various locations around the world, including Estonia, where it is particularly well-known. It is often used as a building material due to its durability and aesthetic appeal. The rock is also of geological interest because it provides insights into the processes that occur during the formation of sedimentary rocks.

The name "kiillekivi" comes from the Estonian words "kiil," meaning "blade" or "sword," and "kivi," meaning "stone." This name reflects the rock's distinctive layered appearance, which can resemble the blade of a sword.

Despite its name, kiillekivi is not inherently dangerous or toxic. However, like any natural material, it should be handled with care to avoid injury. The rock's dark color and distinctive appearance make it a popular choice for decorative purposes, such as in landscaping and interior design.