Locality: The Funderburk prospect (Lat. 34.177°N, Long. 93.659°W), north of Cowhide Cove road, Cowhide Cove Recreation area, on Lake Greeson, approximately 13 km north of Murfreesboro, Pike County, Arkansas, USA.

Occurrence: In fractures in the Jackfork sandstone, with cinnabar, quartz and dickite and other mercury minerals (calomel, eglestonite, mercury, metacinnabar, montroydite, terlinguaite).

General appearance: A matted nest (approximately 3 × 1 mm) of randomly scattered fibrous to acicular crystals.

Physical, chemical and crystallographic properties: Luster: stated to be vitreous, but the optical data indicate adamantine. Diaphaneity: transparent. Color: colorless. Streak: off-white to...

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