Crimson quartzite sandstone. (ripple marks).

Национальный музей Республики Карелия

This is a large fragment of quartzite sandstone with ripple marks which keep the memory of the old times. Ripple marks are the prints that indicate agitation by water or wind on the surface of unconsolidated sediments along different coastal waters (water ripples) or on the open sandy surfaces (Aeolian ripples). Quartzite-sandstone is a ...

Type Material
This is a large fragment of quartzite sandstone with ripple marks which keep the memory of the old times. Ripple marks are the prints that indicate agitation by water or wind on the surface of unconsolidated sediments along different coastal waters (water ripples) or on the open sandy surfaces (Aeolian ripples). Quartzite-sandstone is a highly durable natural stone, which is an intermediate in the transformation of sandstone into quartzite. As for its features, quartzite-sandstone is related to quartzite. It is a very hard and durable stone. Impurities in its composition can be colored in different ways. Quartzite is different from quartzite-sandstone, first of all, thanks to its higher hardness, lack of clastic rocks in its structure (it is nearly impossible to differ grains from cement) and the nature of the fracture. The breed is split integrally, whereas sandstones are split along the grain boundaries. Quartzite-sandstone is used for the construction of masonry walls, columns and facing the basement of the buildings.
There are several explanations for the appearance of the ripples. According to one of them, there were submarine earthquakes, which influenced the mass of stationary sand moving through the hillsides and the layers were approaching one another, crumpling into the ripples. Sand has always fixed shifts of the seabed. Sometimes, the surface of quartzite or sandstone resembles ripples on the water. It reminds us of the "journey" of sand and looks like small dunes. Sometimes ripple marks depend on the tectonic rippled surface, for example, like in Shoksha quartzites in Karelia. Sandstones in Karelia are mostly quartzites. Its colors are different. Shoksha quartzite can be red; quartzite in Sheltozero may be light yellow. White sandstones are more common in Medvezhiegorsk (Voronov Bor). It is common for quartzite-sandstones to have a light shine which make quartz sand sparkle and it also looks like an original color.