The authorLiterary activity -- Sefer Koʼaḥ ha-avanim (On the virtue of the stones) -- The source(s) of Sefer Koʼaḥ ha-avanim (On the virtue of the stones) -- The critical edition of Sefer Koʼah ha-avanim -- Supplements -- Text and translation -- Comparative table -- The Koach ha-avanim in its French context: Romance and Latin terms and sources -- The language -- Lexical and graphical problems -- Lexicological aspects -- Graphical aspects -- Conventions of transliteration -- The sources -- Structure of Supplement B -- Lexicological commentary on the Romance and Latin terms -- Berakhyah's sources -- Tables of the sources -- Anglo-Norman source texts -- Latin source texts -- Hebrew-French/Latin/Greek glossary -- French/Latin-Hebrew glossary -- Greek-Hebrew glossary.