Calcite Stalactite—"Tranquility". China. photo Bonhams

A highly aesthetic formation and a fascinating study in the growth of calcite, this elegant stalactite cluster is covered in calcite micro-crystals and has the overall appearance of a large cauliflower. Offered on a custom-fitted wooden base. Measures 17 x 16 x 9in  Sold for $488

Footnote: Provenance: The Chung-Yan Cheung Collection

Calcite Stalactite Cluster—"Paradise". China. photo Bonhams

Of complex form, having intergrown clusters of trigonal calcite crystals and a mound of druze to the tip of one of the stalactites. Offered on a custom-fitted wooden base Measures 12 x 12 in  Estimate: $500 - 700 - Unsold

Footnote: Provenance: The Chung-Yan Cheung Collection

Calcite Stalactite—"Vitality". China. photo Bonhams

Stalactites and stalagmites are spectacular natural formations in underground caves. They are formed over millions of years by the interaction of water and limestone. In the present specimen, strong orange color and smooth surface texture with black inclusions indicating the deposition of another mineral. Offered on a custom-fitted wooden base. Measures 23 x 13 x 9in  Sold for $580

Footnote: Provenance: The Chung-Yan Cheung Collection

Large Calcite Stalactite Cluster—"Beauty". China. photo Bonhams

A large, conjoined cluster of opaque stalactites of cream color with some orange at the edges. Offered on a custom-fitted wooden base  Measures 22 x 21 x 12in  Sold for $732

Bonhams. Natural History, 27 May 2010. 580 Madison Avenue, New York www.bonhams.com