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Winter 1996, Volume 32, Issue 4

EDITORIAL

In Honor of Robert C. Kammerling p.231

FEATURE ARTICLES

An Update on Imperial Topaz from the Capão Mine, Minas Gerais, Brazil p.232-p.241
Daniel A. Sauer, Alice S. Keller, and Shane F. McClure
Trapiche Rubies p.242-p.250
Karl Schmetzer, Henry A. Hänni, Heinz-Jürgen Bernhardt, and Dietmar Schwarz
Some Gemological Challenges in Identifying Black Opaque Gem Materials p.252-p.261
Mary L. Johnson, Shane F. McClure, and Dino G. DeGhionno
Enstatite, Cordierite, Kornerupine, and Scapolite with Unusual Properties from Embilipitiya, Sri Lanka p.262-p.269
Pieter C. Zwaan

NOTES AND NEW TECHNIQUES

Some Tanzanite Imitations p.270-p.276
Lore Kiefert and Susanne Th. Schmidt

REGULAR FEATURES

Gem Trade Lab Notes p.277-p.281
Gem News p.282-p.292
The Robert C. Kammerling Research Endowment p.293
Book Reviews p.294

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