ZTR index

Heavy mineral concentrated in a beach sand near Chennai, India

The ZTR index is a method of determining how

specific gravity

and resistance to weathering.

References

ISBN 0-7167-2726-9

Hubert, John F., A zircon-tourmaline-rutile maturity index and the interdependence of the composition of heavy mineral assemblages with the gross composition and texture of sandstones, Journal of Sedimentary Research; September 1962; v. 32; no. 3; p. 440-450

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[1] ISBN 0-7167-2726-9