MIXERALOGICAL NOTKS — ANDERSON. 



91 



this mint,' and tlie Comet adjoining."' In the Museum colk^ctiou 

 there is one specimen from this locaHty, consisting of a group of 

 well developed lustrous crystals in a xugh of galena, with powdery 

 limonite. The crystals are of the general habit shown in PI. xix., 

 fig. 3. The crystal there represented measures 1"2 cm. xl"9 cm. 

 X 1 cm. ; it is slightly broken at one end of tlie macro-axis, and 

 the a (100) faces are strongly striated parallel to their intersection 

 with 7U (110). The predominant forms are c (001), a (100), and 

 7n (110); the others are very narrow. Two faces of d (102) 

 admitted of measurement, but the pyi'amids and the dome o (01 1) 

 were determined from single faces. The image obtained from ^ 

 (111) was very poor, the angles being measured in the position of 

 maximum illumination. The measured and calculated angels are 

 given in the followinir table : — 



Mine Mbretrice, New Caledonia. 



There is one specimen witli numerous crystals from this locality 

 in the Museum collection. Tlie anglesite crj^stals, which are 

 small but beautifully and regularly developed, are embedded in a 

 cavernous gossany matrix ; they are transparent and either 

 <;olourless or slightly yellowish, with a vitreous to greasy lustrc". 

 The habit is remarkably uniform, the dominant forms being r 

 (001), 111 (110) and d (102). Two crystals were measured, one 

 .showing only these forms, the other further modified by the forms 

 h (010), o (Oil), z (111), y (122), all with very small faces. 

 (PI. xix., fig. 4). The co-ordinate angles obtained agreed well 

 with the calculated values. 



