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Stone diarist: a ROM geologist delves into atomic structure to discover new minerals.

For many women, the allure of gemstones lies in how they look set in a beautiful necklace or pair of earrings. But ROM mineralogist Kim Tait's interest goes deeper--down to the atomic level at which she analyzes their chemical makeup. The University of Manitoba grad, now responsible for the ROM's approximately 100,000-piece collection of minerals, gems, and meteorites, is searching for new minerals--ones that have not previously been documented by science.

"Minerals are described based on how the elements are put together at the atomic level," says Tait, who is currently on maternity leave and balances baby, Emily, on her lap. "If you think of it like a cookie, you'd typically have your chocolate chips and flour and sugar. But sometimes there's a little oatmeal in there. So with enough oatmeal, it can be a new mineral."

In a basement lab, Tait spends hours at a scanning electron microscope, which reveals a mineral's basic chemistry--in cookie analogy, the ingredients--and X-ray diffraction equipment, which exposes a mineral's structure--or how the ingredients are mixed together. When equipment in the ROM's lab is not powerful enough, Tait travels to Chicago to use a state-of-the-art instrument called a synchrotron--which accelerates sub-atomic particles to almost the speed of light, enabling her to see the crystal structure.

Right now, she's fascinated by phosphates, a group of poorly known minerals she worked on for her Master's degree--work that uncovered a new phosphate, manitobaite, which will soon be published in the Canadian Mineralogist. How minerals behave under extreme conditions is another research interest. By compressing a mineral between two diamonds, she's able to exert gigapascals of pressure--which simulates how minerals might behave deep within the Earth. Not one to leave any stone unturned, last year Tait searched successfully for fragments of the Buzzard Coulee meteorite in Saskatchewan.

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It's hard to know how the Manitoba native squeezes in time for research. Since joining the Museum in 2007, Tait has planned the ROM's new Teck Suite of Galleries: Earth's Treasures, which opened in 2008. Selecting a striking representative showcase of gems, minerals, and meteorites was more difficult than she had imagined--there's display space for only 4 percent of the collection. She has also curated the exhibitions The Nature of Diamonds, and Light and Stone: Gems from the Collection of Michael Scott, and will be co-curating the upcoming Water.

Whew! But she is fuelled by her fascination and passion for minerals. As a child Tait was always picking up and admiring rocks and by age 7 was bringing them home to add to her collection. "Both my parents thought I was crazy," she says, "but geology was something I was interested in before I could even spell it." In an effort to please her family of teachers, she signed up to study education, but "after taking an intro geology course," she notes, "that was all over." Well, not quite. Today she is cross-appointed as a professor at the University of Toronto.

Tait still has a small mineral collection at home. "I do like wearing gems," she admits, "but I haven't bought a lot for myself." Instead she is building the ROM's collection--including such recent acquisitions as a fabulous collection of minerals from Malawi and a pallasite meteorite.

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Kimberly Tait

ASSOCIATE CURATOR

Department of Natural History

Education

2009

Fellow of the Canadian Gemmological Association

2007

Ph.D. in Geosciences, University of Arizona

2002

Master's in Geology, University of Manitoba

1999

Bachelor of Geology, University of Manitoba

ONTARIO

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Janet Waddington

ASSISTANT CURATOR

Invertebrate Paleontology

The Late Silurian Eramosa Formation on the Bruce Peninsula, a significant source of building and dimension stone for the construction industry, is also the subject of much scholarly interest for its extraordinarily well preserved fossils. Waddington is currently studying fossil scorpions that originated from active quarries or from loads of stone headed for landscaping projects. A new species offers insights into how animals made the transition from water to land.

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Title Annotation:Our Curators
Author:Jack, Lee-Anne
Publication:ROM Magazine
Geographic Code:1CANA
Date:Jun 22, 2010
Words:662
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