All are made largely of aragonite, the original shell material. The recent shells retain the organic material that give the shells their color and nacreous sheen. Nacre (mother of pearl) is an ...

Biden administration casting itself as good stewards of the environment and champions against climate change, a Democratic ...

Other types of allochems include intraclasts, pellets, and ooids. Aragonite - A mineral with the same chemical composition as calcite (i.e., calcium carbonate) but with a different crystalline ...

Never studied before, this oyster glue has characteristics rarely found in similar organisms: it's made of a mineral called ...

The reason for this is that calcium promotes the formation of the mineral aragonite, which binds CO 2 and thus prevents the release of this greenhouse gas into the atmosphere. The results could ...

along with gritty bits of white aragonite that we had acquired while squeezing through a tight formation-lined tube. From the entrance, we had descended a series of climbs, stoop walks ...

Cuttlebone is made of aragonite, a porous form of calcium carbonate, and helps the animal maintain buoyancy and protects its ...

The oyster or mussel slowly secretes layers of aragonite and conchiolin, materials that also make up its shell. This creates a material called nacre, also known as mother-of-pearl, which encases the ...

Over the long term, as coral reefs continue to build themselves up, the framework of the coral reef is filled with sediment and cemented with calcite and aragonite. If sea level changes ...

When research on an intriguing material called for hundreds of samples, secondary-school students, teachers and technicians stepped up.

The bulk of an ooid, filling this lattice, is a crystalline mixture of aragonite and calcite. In the discussion we assess meteoritic in-fall as the source of this lattice material. Present-day ...

克拉通是指古老的、稳定的大陆块体，它主要由古代的结晶基底构成，形成的年代大多是在30多亿年前。其特点是具有较冷的地温梯度、贫铁贫水且存在多种交代变质作用。全球的克拉通在60-160 ...