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La Derriksite, CU4(U02) (Se03)2 (OH)6' H20, Une Nouvelle Espèce Minérale Par FABIEN CESBRON, Laboratoire De Minéralogie-Cristallographie, Associé Au C

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La Derriksite, CU4(U02) (Se03)2 (OH)6' H20, Une Nouvelle Espèce Minérale Par FABIEN CESBRON, Laboratoire De Minéralogie-Cristallographie, Associé Au C Bull Soc. fr. Minéral. Cristallogr. (1971), 94, 534-537. La derriksite, CU4(U02) (Se03)2 (OH)6' H20, une nouvelle espèce minérale par FABIEN CESBRON, Laboratoire de Minéralogie-Cristallographie, associé au C. N. R. S., Université de Paris VI (1), ROLAND PIERROT, Direction du Service Géologique National, B. R. G. :vi., Orléans (2), et THÉODORE VERBEEK, Union Minière Exploration and :vIining Corporation Ltd, Toronto, Canada. Résumé. - La derriksite, CU4 (U02) (SeOS)2 (OH)6' Hp, a été trouvé à Musonoï, Katanga, othorhombique, Pnmm ou Pnm2 ; a = 5,57, b = 19,07, C = 5,96 A. Z = 2. a/b/c = 0,2921/1/0,3125. dx = 4,72. Les raies les plus intenses du diagramme de poudre sont les suivantes: 5,35 (mF), 4,78 (FFF), 4.35 (F), 4,07 (FF), 3,74 (FF), 3.43 (mF), 3,21 (F), 2,85 (mF), 2,43 (mF), 2,30 (mF), Analyse chimique (microsonde électronique) CuO = 35,67, UOs = 32,67, Se02 = 24,87, H20 = 8,10 (thermobalance CAHN) total = rol,31. Les cristaux vert clair sont allongés suivant [OOlJ et aplatis suivant (roo), bon clivage suivant (oro). Biaxe, 1,77, n'm = 1,85, 1,89; la courbe de déshydratation est donnée. n" = n'. = Ce nouveau minéral a été trouvé dans la zone d'oxydation du gisement cupro- cob alifère de Musonoï (avec demesmaekerite, marthozite, guilleminite) le nom est donné en l'honneur de J. Derriks. La derriksite a été approuvée avant publication par la Commission des nou- veaux minéraux et nom de minéraux de l'AIM. Derriksite, CU4 (U02) (SeOS)2 (OH)6' Hp, a new mineral. Abstract. - Derriksite, CUi (U02) (SeOS)2 (OH)6' H20 found in Musonoi, Katanga, is orthorhombic, Pnmm or Pnm2; a = 5.57, b = 19.07, c = 5.96 A, Z = 2. a/b/c = 0.2921/1/0.3125. dx = 4.72. The strongest lines in the powder pattern are: 5.35 (W), 4.78 (VVS) 4.35 (S), 4.07 (VS), 3.74 (VS), 3.43 (W), 3,21 (S), 2.85 (W), 2.43 (W). 2.30 (W). Analysis gave (microprobe) CuO = 35.67, UOs = 32.67, Se02 = 24.87, Hp = 8.10 (CAHN ther- mogravimetric analysis). Sumo 101.31. Crystals, clear green, are elongated on [OOlJ and flattened on (100). Cleavage good on (oro). Optically biaxal, n" = 1.77. n' m = 1.85, n'. = 1.89. The deshydratation curve is given. This new mineraI was found in the oxidation zone of Cu-Co deposit at Musonoi (with demesmaekerit, marthozite, guilleminite). Named in honour of J. Derriks. The mineraI was approved before publication by the Commission on new minerai and mineraI names of the IMA. INTRODUCTION. Ce nouveau minéral est nommé en l'honneur de Joseph DERRIKS, géologue, qui a étudié pen- La derriksite est le plus rare des uranyl-sélé- dant des années le célèbre gisement de Shinko- nites trouvés au Katanga dans la zone d'oxyda- lobwe. tion du gisement cupro-cobaltifère du Musonoï Ce nouveau minéral a été accepté par le Comité (R. Pierrot et al., 1965 et F. Cesbron et al., 1965 français de nomenclature puis soumis à la Com- et 1969). mission des nouveaux noms et des noms de miné- (1) Tour 16, 9, quai Saint-Bernard, Paris (5e). raux de l'AIM qui l'a acceptépar I8 voix contre 0 (2) Boîte postale 60°9, 45-0rléans-02. (vote I4 septembre I97I nO 3 de la liste I97I). 535 TABLEAU Il. MORPHOLOGIE. Diagramme de poudre de la derriksite. La derriksite se présente en enduits micro cris- -~--k1--- tallins de couleur vert clair à vert malachite sur 1 dca!~i des sulfo-séléniures de cuivre (digénite séléni- fère). Quelques rares cristaux, vert bouteille et ne dépassant pas 0,7 mm ont été observés sur 5,69 f 1 1 5,689 <fff °1 de la malachite en compagnie de cha1coménite 5,58 ° ° 5,57° et de demesmaekerite : ils ont pu être étudiés 5,35 mF 110 5,347 4,81 ff 120 4,4°9 au goniomètre à deux cercles. 4,78 FFF 4 4,768 ° ° 4,352 F 3 1 4,348 ° 4,197 mF 13° 4,189 4,°72 FF 1 1 4,°7° 3,983 f 1 °1 1 3,980 3,748 FF 121 3,743 3,629 ff 14° 3,622 3,432 mF 131 3,427 3,218 F 5 1 3,213 3,185 Hf °060 3,178 110 110 3,152 ff 15° 3,147 3,°98 f 141 3,°95 2,983 mf 2 2,980 2,850 mF ° °2 2 2,844 2,762 ff °16o 2,761 2,676 fff 220 2,673 2,632 ff 1 2 2,628 FIG. r. 2,606 ff 112° 2,6°3 2,556 ff 23° 2,551 2,537 Hf 122 2,533 2,529 ff 4 2 2,527 Ces cristaux, orthorhombiques, sont allongés ° suivant [00l] et aplatis, tout en étant légèrement 2 1 2,523 ° bombés, suivant (100) (fig. 1). Les coordonnées 2,5°6 f 161 2,5°5 211 des pôles des faces sont données dans le tableau 1. 2,5°1 f 7 1 2,478 ° Hf 17° 2,447 TABLEAU 1. 221 2,439 2,433 mF 132 2,428 Coordonnées des pôles 2,349 fffd 231 2,345 des faces de la derriksite. 2,3°6 mF 142 2,3°1 2,261 Hf 171 2,264 2,254 f 25° 2,249 (h k 1) p 2,169 f 062 2,174 152 2,164 2,096 Hf 26o 2,°95 fd 2 2 (0 1 0) 0° 2,036 2,°3'5 (1 0) a : b : c 0,2914 : ° 9°° = 1,996 ffd 9 1 1,997 (1 °1 0) 1 : 0,3137 73° 45' 1,987 ffd °222 l,99° (1 2 1) 59° 29' 1,953 Hf 27° 1,948 1,897 mf 3 3 1,896 1,876 ff °191 1,879 PROPRIÉTÉS CRISTALLOGRAPHIQUES. 242 1,871 1 3 1,871 1,839 f 123° 1,836 Les clichés obtenus à l'aide des chambres de 1,824 Hf 320 1,822 Weissenberg et de précession ont conduit aux 1,808 Hf 28o 1,8u valeurs suivantes: 1,798 ff 252 1,795 As 133 1,795 a = 5,57:1: 0,01 A V = 633 1,766 mf 182 1,766 b = 19,07 :1:0,03 A 311 1,765 c = 5,96:1: 0,01 A a: b :C= 0,2921 : 1 :0,3125 F. CESBRON, R. PIERROT ET T. VERBEEK Les groupes spatiaux possibles sont Pnmm ou microthermobalance CARN RG. Les résultats Pnm 2. Le diagramme de poudre (tableau II) a sont donnés dans le tableau IV et conduisent à été obtenu à l'aide d'une chambre Guinier-de la formule: Wolf Nonius, travaillant avec la longueur d'onde 4CuO . V03. 2Se02. 4R20, soit: du cuivre KiXl. CU4(V02) (Se03)2 (OR)6 .R20. PROPRIÉTÉS PHYSIQUES ET OPTIQUES. TABLEAU IV. ___n..__ La derriksite présente un très bon clivage sui- ---------- vant (010). La densité n'a pu être mesurée à cause (%) (%) RAPPORTS de la trop faible quantité de produit disponible; MOLÉCULAIRES avec un nombre d'unités formulaires égal à 2 ~---~_.._-- on obtient une densité théorique de 4,72, ce qui Cu 28,5 35,67 0,448 4 semble tout à fait admissible pour ce genre de U 27,2 32,67 0,114 1 composé. Se 17,7 24,87 0,224 2 La derriksite est biaxe, le plan des axes op- 8,10 0,450 4 tiques étant (010) l'orientation de l'ellipsoïde des Total 101,31 indices est la suivante: allnp, b1Inm et clin.. np est égal à 1,77, les deux autres, supérieurs à 1,80, n'ont pu être mesurés, le minéral étant instan- tanément corrodé par les liqueurs d'indice supé- COMPORTEMENT THERMIQUE. rieur à 1,800. Ces deux indices ont donc été obtenus à partir de la mesure des pouvoirs La courbe d'analyse thermogravimétrique a réflecteurs de la face (100) préalablement polie: été réalisée avec une électrobalance CARN RG les résultats, pour différentes longueurs d'onde, sur 4,96 mg de derriksite. Il n'est pas très facile sont rassemblés dans le tableau III. de distinguer entre la fin de la déshydratation et le début du départ de Se02 ; d'ailleurs l'absence TABLEAU III. de palier indique que le composé anhydre n'est pas obtenu. Nous interprétons cette courbe de Indices n' m # nm et n'. # n. de la derriksite la façon suivante. en fonction de la longueur d'onde. - jusqu'au point A : perte de la molécule d'eau de cristallisation; - du point A au point B : perte des trois mo- "nm n'. n' m "nm n'. n'nt lécules d'eau de constitution; -----.- --------"------------- - du point B au point C : départ de la pre- 420 1,97 l,go 580 1,88 1,82 mière molécule de Se02. 440 1,94 l,go 600 1,87 1,82 - du point C au palier final (D) : départ de 460 l,g2 1,88 620 1,87 1,82 la deuxième molécule de Se02. 480 l,go 1,86 640 1,87 1,81 Il est très vraisemblable que, comme pour les 500 l,go 1,85 660 1,87 1,81 520 1,89 1,85 680 1,86 1,80 autres uranyl-sélénites, le départ d'oxygène cor- 540 1,88 1,84 700 1,86 1,80 respondant à la réation 3V03 -+ V30S + 1/202 560 1,88 1,83 s'effectue en même temps que le départ de Se02.
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