HTH

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Note added at 13 mins (2007-06-20 19:35:00 GMT)
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A Lexicon of Cave and Karst Terminology

conulite. A hollow, cone-shaped speleothem formed when a conical depression is drilled in cave mud by falling water. Subsequent erosion may remove the mud, isolating the calcite lining of the depression[10].



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Note added at 15 mins (2007-06-20 19:37:15 GMT)
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http://www.caves.org/pub/journal/PDF/V38/v38n3-Peck.htm

The term "conulite" was proposed by Thayer to name a hollow calcite speletothem from Morris Cave, Vermont. (...)


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Note added at 17 mins (2007-06-20 19:39:12 GMT)
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http://wasg.iinet.net.au/glossary.html

CONULITE. n. A speleothem resembling a hollow tube or cone formed in mud, sand or other soft material as the result of water dripping in the one spot. The drill-hole is gradually lined by the deposition of calcite from solution. Erosion of the surrounding soft material may leave the crystalline cone free standing.