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Not All That Rocks, Is Rock

29,292 просмотров • 1 год назад •via X (Twitter)

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These rocks in the Algerian desert sounds like an empty metal tank ... Ringing rocks are a fascinating geological phenomenon where specific rocks resonate with a bell-like sound when struck. These seemingly ordinary rocks hold a hidden musicality, captivating scientists and music enthusiasts alike. Although scientists don’t have a definitive answer as to why the rocks ring, they do have a name for ringing rocks. They are called with sonorous rocks or lithophonic rocks. These are terms that are given to rocks that resonate with bell-like sound when they are struck. Ringing rocks can be found in various locations worldwide, often in clusters within specific geological formations. Sonorous rocks are rocks that resonate like bell when struck. These chime-like sounds come from geological phenomena known as ringing rocks. Physically, they look no different from regular rocks, but it’s not until you lightly strike them with hammer that rocks reveal their sonic secret. Stones do not usually ring, but when these particular stones are struck lightly with hammer, they will vibrate and make a sound not unlike that of a bell. Why they do this is still a mystery to science. Rocks themselves are composed of diabase, same type of rock that makes up most earth's crust. Another part of mystery is while all rocks seem to be made of same material (mostly iron and hard minerals) only one-third of them generate ringing sound when hit. Rocks that ring are known as "live" rocks and those that don't are referred to as "dead" rocks. Key lies in rock's composition and structure. Ringing rocks are typically fine-grained, silica-rich rocks like quartzite, rhyolite or basalt. These materials have a dense, homogeneous structure with minimal internal flaws, allowing sound waves to travel efficiently. When struck, rock vibrates at its natural resonant frequencies, producing a clear, ringing tone. The specific pitch depends on the rock's size, shape, and composition. There has been a great deal of controversy concerning the ringing ability of boulders; conversely, there has been an almost complete lack of testing to support the conjectures. Conditions such as size and shape of boulders and the way that the boulders are supported or stacked certainly influence sounds that boulders make but do not in themselves impart the ringing ability. Although sound is often described as metallic, it is most likely due to a combination of the density of the rock and a high degree of internal stress. Sound can be duplicated on small scale by tapping handle of ceramic coffee cup. The iron content of the diabase is often identified as the source of the ringing ability. Actual chemical analysis of Coffman Hill diabase shows that iron content (ferric oxide) of rock ranges from 9-12%. Although comparatively high for an average igneous rock (3% is typical for granite), it is within the normal range for a basalt. This point suggests that iron content is not a primary factor in the ringing ability. So far, there has been only one published scientific experiment on source of ringing ability. In 1960s, a Rutgers University professor did an informal experiment where specimens of "live" and "dead" ringing rock boulders from Bucks County park site were sawed into thin slices and then measured for changes in shape. Rock slices were measured with delicate foil strain gauges, which could measure minute changes in size. Another theory is that elastic stresses remained in rock when boulder fields formed and slow weathering rate keeps stresses from dissipating. A possible source of stresses would likely be loading stresses from time when rock crystallized. Diabase sill formed at roughly 1.2–1.9 miles beneath the surface. This "relict stress" theory implies that ringing rock boulders act much like guitar string. When guitar string is limp it does not resonate, but a plucked string will provide a range of sounds depending on level of applied tension. 🎥© Lone Wolf #archaeohistories

Archaeo - Histories

12,175 просмотров • 1 год назад