Rare Mineral Vaterite
TerraGreen|April 2018

Discovered in Plants for the First Time

A rare mineral (vaterite) with potential industrial and medical applications has been discovered on alpine plants at Cambridge University Botanic Garden.

Rare Mineral Vaterite

Scientists at Sainsbury Laboratory Cambridge University have found that the mineral vaterite, a form (polymorph) of calcium carbonate, is a dominant component of the protective silvery-white crust that forms on the leaves of a number of alpine plants, which are part of the Cambridge University Botanic Garden’s national collection of European Saxifraga species. Naturally occurring vaterite is rarely found on Earth. Small amounts of vaterite crystals have been found in some sea and freshwater crustaceans, bird eggs, the inner ears of salmon, meteorites, and rocks. This is the first time that the rare and unstable mineral has been found in such a large quantity and the first time it has been found to be associated with plants. The discovery was made through a University of Cambridge collaboration between the Sainsbury Laboratory Cambridge University microscopy facility and Cambridge University Botanic Garden, as part of an ongoing research project that is probing the inner workings of plants in the Garden using new microscopy technologies. The research findings have been published in the latest edition of Flora.

The laboratory’s Microscopy Core Facility Manager, Dr Raymond Wightman, said vaterite was of interest to the pharmaceutical industry: “Biochemists are working to synthetically manufacture vaterite as it has potential for use in drug delivery, but it is not easy to make. Vaterite has special properties that make it a potentially superior carrier for medications due to its high loading capacity, high uptake by cells, and its solubility properties that enable it to deliver a sustained and targeted release of therapeutic medicines to patients. For instance, vaterite nanoparticles loaded with anti-cancer drugs appear to offload the drug slowly only at sites of cancers and therefore limit the negative side-effects of the drug.”

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