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UNITED NATIONS

ECONOMIC

SOCIAL COUNCIL AND

Distr.

LIMITED

e/ot. 14/MIW/l8/Corr. 1

23 October I968 ORIGINAL: FRENCH

ECONOMIC COMMISSION FOR AFRICA Seminar on Hew Metals and Minerals Addis Ababa, 5-10 February I968

BERYLLIUM, CAESIUM, NIOBIUM (COLUMBIUM), GERMANIUM, HAFNIUM,

THE RARE EARTHS, TANTALUM, TITANIUM, YTTRIUM, AND ZIRCONIUM

Production, Demand and Commercial Prospects

Corrigenda

On page 8 of English translation, first line, for "Cs Al SiQ 0

read " . 2Cs2O 4 —4 "*9 "26

. 9Si 0 )"; in second, thirteenth and

2 AlgO . 9Si 02

nineteenth lines, for "Cs Og", "Cs2 0 ", and "Cs 0 " respectively read "Cs 0".

On page 21, formulae for ores should read as follows:

Argyrodite (4 Ag2 3- Ge S ) Germanite (?Cu S - FeS - Ge S ) Canfieldite (Ago - Sn Sfi)

Renierite (Cu (Fe, Ge) S )

On page 36, formulae for ores should read as follows:

Tantalite: (fa Nb)2 0 (Fe, Mn) 0

Microlite: Tan 0c Ca 0 2 5 Tapiolite: Ta? 0 Fe 0

Colombo-tantalite: (Nb Ta)Q 0 (Fe Mn) 0

Fergusonite:

Samarskite:

Euxenite:

Nb Ta)

5

(Y Ce)

2

(Nb Ta)2 0 (Fe Cu U02 (Y Ce U Th) (Ti Nb Ta)

0 (Y Ce)2 0

M68-I487

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