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Viral video circulating online shows how heavy rain recently turned an island’s landscape blood-red.
Hormuz Island off Iran in the Persian Gulf turned a deep crimson, dramatic footage shows, after a downpour which had washed over the Middle Eastern island’s aptly named Red Beach.
The rainwater is said to have mixed with mineral-rich sediment and seawater, creating a vivid, blood-red scene.
Hormuz Island was turned red by the heavy rainfall on Dec. 16, which is a result of its iron oxide-rich soil, according to reports.
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In a clip shared on Instagram, the heavy downpour is seen mixing with the deeply colored earth, bringing deep red sediment downhill and into the ocean.
“Hormuz Island is mostly formed of red soil and salt rock,” according to a study by Science Direct, where researchers looked into heavy metal content in the region’s soil.
“The red soil originates its color from a mixture of hematite and iron hydroxides, but the amount of hematite dominates over iron hydroxides,” the journal wrote.
Hormuz Island is a small key in the Strait of Hormuz off Iran’s southern coast, and is also home to a few thousand residents.
It’s also known locally as “Rainbow Island” because of its multicolored soils and rock formations.
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Reports of the red rain had sparked comparisons to “blood rain” described in ancient texts, but scientists say it’s all completely natural.
“The island is a salt dome, a teardrop-shaped mound of rock salt, gypsum, anhydrite and other evaporites that has risen upward through overlying layers of rock,” researchers from Nasa’s Earth Observatory explained.
“Rock salt or halite is weak and buoyant, so it loses its brittleness and flows more like a liquid when under high pressure,” they added.
The striking color is also said to come from iron-oxide–rich soil, locally called “golak”, that covers much of Hormuz’s surface.
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When heavy rain hits the island’s hills and cliffs, water mixes with this mineral-rich earth, carrying fine red particles into creeks, rivers and eventually into the Persian Gulf.
As the iron oxide becomes suspended in the water, it absorbs shorter wavelengths of light and reflects longer red wavelengths, giving the runoff and coastal waters a crimson color.
Researchers also said that “blood rain” events happen when rain or runoff contains dust, mineral-rich soil or algae.
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