These usually include heavy minerals or fossil fragments.

Callisto was extremely shy of heavy minerals, which made them all the more valuable.

However, the potential for clay, dolomite, heavy minerals and building gravel merits also to be considered.

Sand can contain any of several heavy minerals in addition to the standard silicon dioxide (quartz).

It also removes phosphorus, heavy minerals, and oils from the water.

Samples of stream waters and heavy mineral concentrates are also taken at the same sites.

Uma is the only sure indicator for the presence of heavy minerals.

Cinnabar is a heavy, fragile and quickly worn mineral.

The coastline is also relatively rich in heavy minerals, with significant amounts of zircon having recently been discovered.

Have been mass sorted such as heavy mineral concentrates found in deserts and beach sands.