David M. Larrabee, 70, a retired U.S. Geological Survey scientist, died of heart disease Thursday at his home in Somerset, Md.

A geologist in nonmetallic and industrial minerals, he retired from the survey in 1970 because of poor health.

Mr. Larrabee first joined the survey in 1942. He made studies of mica and beryl deposits in New England and North Carolina and then helped develop mica deposits in Brazil and Mexico for use in World War II.

In 1947, he returned to the Staso Milling Co. in Vermont, where he had worked earlier on geological studies of slate and other minerals in New England.

Mr. Larrabee rejoined the geological survey in 1953. His studies of non-metallic minerals and geological mapping took him throughout the eastern part of this country from the Canadian border to Alabama. He received the Interior Department's Meritorious Service Award shortly after retiring.

Mr. Larrabee was born in Williamsport, Pa. A graduate of Dartmouth College, he earned a master's degree from the University of Illinois.

The author of numerous publications, he was a member of the American Institute of Mining, Metallurgical and Petroleum Engineers, the Geological Society of Washington, the Geochemical Society, the Society of Economic Geologists and the American Institute of Professional Geologists.He was a fellow of the Geological Society of America and the American Association for the Advancement of Science.

He is survived by his wife, the former Kate Putnam, of the home.