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Dwarves' Earth Treasures Museum:
"Black River" Agates
Mesopotomia Region, Argentina, South America
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    Those agates were found along the rivers around Mesopotomia Region even it was stated that some agates are found along Rio Negro river, hence "Black River Agates". They may have been weathered from the same basalt formations that produced the world-famous Brazillian Agates in Brazil and Urugway. The agates are typically white to gray with some yellowish hue, and as in their rough forms, they would look strongly brown to yellow, sometimes orange. Some agates would look better as rough forms while others would look better as polished forms and it's rare to find any agates with some colors.

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Rough Appearance: River-worn pebble brownish forms
Agates come with dull colors but can come in bright constrasting black and white colors

 
Typical agates Typical Agats with some shadowing effect
Desired white and black color combo It's rare to find such colorful agates.
Colors due to weathering, may will be dull if cut.  Outstanding example of agate in its natural form.

You can see some Black River Agate Agates for Sale at the Online Agate & Thunderegg Shop