262 



THE GUIDE TO NATURE. 



• ^VAVAVAVAVAVAVAV/LyAV^VAVAYAYAVAYAVAY^^VAVA'VXVAVAVAVAyxvA ^ 



yyw ywwwwwwwwuww yyw 



ipCK&xxyxx x xK&xxttXxaxjxio ct x nz oc^ 



THE MINERAL COLLECTOR 



ETT^OOryrrrinrwrr rin nrrrYr^^ rT^TTriyrrrrniri^irrrrinng^^ 





■ j,yAVAVAVAVAVA.VAnVAVAVAVA . 7^VAYAyAVA7A7AVA7AVAVAVAVAVAVAv ryr 

 Address all correspondence to Arthur Chamberlain, Editor, 56 Hamilton Place, New York City 



Quartz. 

 Quartz is one of the most beautiful 

 and widely distributed minerals. It has 

 probably been responsible for the start- 

 ing of more collections than any other 

 mineral on account of the two facts 



No. 1. QUARTZ CRYSTALS FROM HOT SPRINGS. 



stated above. It is almost impossible 

 to walk anywhere without coming in 

 contact with it. The sands of the sea- 

 shore are quartz ; the pebbles found 

 there and in the ground are mostly 

 quartz. Almost all minerals have 

 quartz either attached or in combina- 

 tion with them. Then there are a great 

 many different varieties of quartz : rock 

 crystal, yellow, smoky, milky, ame- 

 thystine, star quartz, cat's eye, all the 

 various agates, chalcedony, all the dif- 

 ferent clear quartz containing other 

 minerals as rutile, tourmaline, etc., etc. 

 Space will not permit us to give even 

 the briefest description of all of them 



so we will give a description of only the 

 few we have pictured here. 



No. 1 is a group of transparent quartz 

 crystals from Hot Springs, Arkansas. 

 The sharp angles and beautiful natural 

 polish of these crystals are superior 

 to any lapidaries' work. They occur 

 generally in six-sided crystals, but are 

 sometimes modified. Their termina- 

 tions are also often modified. The 

 crystals in this group have but one ter- 

 mination and are known as singly-ter- 

 minated crystals. 



No. 2 shows a doubly-terminated 

 milky quartz crystal from Westphalia, 

 Germany. These crystals are entirely 

 opaque and the color of milk. They 

 are also mostly modified in form as this 

 picture shows. 



No. 3 is a quartz geode ; that is, a 

 nodule more or less rounded in form 

 which when broken open is found to be 

 lined with quartz crystals which in this 

 case are opaque. It is in fact a minia- 

 ture quartz cave. It is from the Green 

 River, Iowa, the waters of which had 

 gradually washed it out from the soil 

 or softer rock in which it was formed. 



No. 4 is an agate from Brazil. This 

 variety of quartz is probably more ad- 

 mired by persons who know nothing of 

 minerals than by the mineralogists 

 themselves on account of its beautiful 

 colors and markings. It is also used 

 more for jewelry than any other variety 

 of quartz. These high colors and mark- 

 ings are often taken advantage of in the 

 cutting of cameos and intaglios by cut- 

 ting faces or forms so that the different 

 layers of colors will harmonize with the 

 subject selected. They are also cut for 

 rings, scarf pins and watch charms so^ 

 as to show two or more layers of color. 

 When black and white are shown they 



