More than 90% of all volcanic rock on Earth is basalt. Rapid-cooling, fine-grained basalt is chemically equivalent to slow-cooling, coarse-grained gabbro. The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. Basalt is also an important rock type on other planetary bodies in the Solar System.

2023年6月3日 · In this article, we will explore the different patterns found on basalt and what they can tell us about the formation and history of the rock. One of the most common patterns found on basalt is the hexagonal pattern of columnar basalt. This pattern is formed when lava cools and contracts, causing it to fracture into geometric shapes.

These columns of rock are most likely a volcanic rock called basalt. (Basalt makes up about 90% of all the lava rock on Earth.) How do these basalt columns form? Or, more specifically, how is it possible for it to form such perfect columns, many of which look like they are hexagonal cylinders?

2023年4月23日 · Basalt is known for its dark color, typically ranging from black to dark gray, and its fine-grained texture. It is composed mostly of minerals such as pyroxene, plagioclase feldspar, and sometimes olivine. Basalt can have a range of compositions, but it is typically rich in iron and magnesium, and low in silica.

2021年5月12日 · If you’ve ever seen cliffs made of towering columns, it’s hard to forget that gorgeous, dark rock, fitted together in a near-perfect repeating pattern. It’s mesmerizing and it inevitably raises the question — how on Earth did that happen? The story starts millions of years ago, deep in the Earth.

2013年2月2日 · Basalt is a common volcanic rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of our planet. Jointed basalt columns, as the most famous and most beautiful basalt formations, exists on many places on earth.

2024年10月16日 · Soft, flat, basalt rocks are perfect for getting the best skips. This cowl only uses knit stitches with special instructions for the first and last stitches to create a beautiful edge. A great project for beginners through experienced knitters …

2022年3月11日 · These Basalt rocks were hand cracked and used to build the walls on my home. Many of these rocks have these semi circular pattern, made of the basalt itself. It's just a bit darker than the rest of the stone. I am wondering what caused it.

2020年9月28日 · Written for two sizes - a generous wrap (shown), or a smaller scarf, you’ll find it hard to knit just one.

Basalt is an asymmetric shawl that can be crocheted bottom-up or top-down (instructions are given for both within this pattern). It’s based on the beautiful geological feature of hexagonal basalt columns that are found across the planet.