The basalt beds around Luna, New Mexico have produced several similar types of agates passed as just "Luna Agates" which leads to the confusion with purple colored Luna Agate from Mexico. They tend to be found in large sizes under the blanket of pine needles. Most are fractured, and come in the colors of white, gray, and faint blue/lavender and I have yet to hear anything about colors. I get an impression that they may have formed the similar way the Big Diggin Agates did which the agate fill in the irregular gaps lined with calcite. The Luna Agates appeared to have already weathered out out of the basalt beds and what remained of calcite are their crystal impressions on the agates.

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Rough Appearance: Irregular geometric shapes, usually with calcite impressions all over.
Agates typically clear and colorless sometimes with faint white to gray banding.