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You may be looking at a predatory mite hunting cyclamen mites.

Check this page:
Greenhouse IPM Programs

Great Picture! Huge, but a great picture.

Regardless, if you wish to be rid of them, check this link as it indicates that control measures for most of the species we've been discussing are...

The most common mites on impatiens seem to be either spider mites, which are often the two-toned colors you mentioned, or broad mites, but those seem to head for the leaves.

Here is a pic of...

Two questions:
1) Can you take and post a picture?
2) What are NGI?