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Back Issues: September/October 1999

TwinsCalcite twinsMineral artMuseums

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
 

308 The Four Twin Laws of Calcite and How to Recognize Them
 

318 Chinese Beryl Crystals Mimic Twinning
 

321 Observations on the Strength of Twin Planes
  

324 Connoisseur's Choice: Chrysoberyl, Minas Gerais and Bahia, Brazil, and Takovaya, Russia
 

328 From Minerals to Art
 
332 Illuminating the Present
335 Rock Chips: Carbonate Concretions, Part 2
 
342 Media Reviews
 


DEPARTMENTS

291 Chips from the Quarry

295 Letters to the Editor

298 Geo-Currents: Coral
 

344 Museum Notes & Announcements

346 Internet Directory for the Earth Sciences

349 Coming Events

351 Classifieds

 

 

 

 

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