160 



Wavellite. Queensland, Lucknow, Cangi, Boro (?). 



Tiu-quoise. See Gems (cases 49, 78, pages 19, 101). 



Callainite. Nevada. 



Variscite. Utah.. 



These are all hydrated. phosphates o£ alumina. 



Apatite. Phosphate and chloride of lime. A valuable mineral when 



found in quantity (see case 91 and page 127). It is frequently 

 found crystallised, the characteristic formheinga six-sided, prism: 

 and sis-sided pyramid ; it is sometimes terminated by flat ends. 

 744, Canada : typical crystals.* Apatite varies considerably in 

 colour — green, brown, red. In addition to Canada, apatite is 

 shown from Eussia, ]N"orway, and 'New York State. In this 

 State it has been found at Gordonbrook only, where it occurs 

 as a narrow vein in granite (see case 76, page 96). f 



Sock-Salt. Chloride of sodium. Crystals — cubes — from Cheshire and 



Kansas. (For commercial rock-salt see case 108, page 135.) 

 In case 108 will also be found a specimen from Peru, where it 

 occurs as an efflorescence on the surface of the ground. In 

 JSTew South Wales it occasionally occurs in crevices of rocks, 

 where it is protected from rain-waters ; as an example of this a 

 specimen from the Central Macdonald Eanges is exhibited. 



* A good crj'stal will be found in case 33. 



t Apatite is very common as microscopic crystals in granite and many other igneous 

 rocks. 



