Wollaston (1766 - 1828) was an English chemist and physicist, but also interested in astronomy and botany.

He is best known for his formulation of a table of relative particle weights, also known as "chemical equivalents".

He discovered palladium (named after the recently discovered astreroid Pallas) and rhodium (after the Greek word for rose) during his studies of platinum.

He was also the first person to observe ultraviolet radiation, and in 1801 he discovered dark streaks in the spectrum of sunlight. Later, these lines were studied by Joseph von Fraunhofer, and they are now known as Fraunhofer lines.

The mineral Wollastonite is named in his honor.

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