Back Issues: September/October 1999


Twins, p. 300			Calcite twins, p. 308		Mineral art, p. 328		Museums, p. 344

ABOUT THE COVER: Calcite twin, 5 cm high, with hematite inclusions, Lei Ping mine near Gulyang, southern Hunan Province, China. Werner Lieber specimen and photo. See related articles on twinning in this issue.

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Rocks & Minerals (74:05)
September/October 1999

FEATURES

300 Twins: Crystal Curiosities
Werner Lieber

308 The Four Twin Laws of Calcite and How to Recognize Them
R. Peter Richards

318 Chinese Beryl Crystals Mimic Twinning
John S. White, R. Peter Richards

321 Observations on the Strength of Twin Planes
John S. White

324 Connoisseur's Choice: Chrysoberyl, Minas Gerais and Bahia, Brazil, and Takovaya, Russia
Robert B. Cook

328 From Minerals to Art
Susan Robinson

332 Illuminating the Present
Peter I. Russell

335 Rock Chips: Carbonate Concretions, Part 2
R. V. Dietrich

342 Media Reviews
Robert B. Cook, Jeffrey A. Scovil, William W. Pinch

DEPARTMENTS

291 Chips from the Quarry

295 Letters to the Editor

298 Geo-Currents: Coral
Jane M. Matty

344 Museum Notes & Announcements

346 Internet Directory for the Earth Sciences

349 Coming Events

351 Classifieds