CATALOGUE OF GEMS AND PKECIOUS STONES. 139 



The sloping shelf on the north side of the case illustrates the mineral intents of the 

 gem po k'ets: A sample of the gem-bearing clay or pocket material is firs shown 

 below which is an equal amount of similar gem clay separated into its constitu tent 

 nnnTraTs thus the relative proportions of the gem tourmaline, the clay washed into 

 Tpoctt tm the decomposed gabbro country rock, and the various minerals asso- 

 ciated with the gem tourmaline are exhibited. For example the pocket matenal 

 from ^Tourmaline King mine (no. 90312 and 90308), at Pala, shows much lepidolite, 

 orthodL clay and gem tourmaline (pink and green), and smaller amounts of mus- 

 ette and qui tz. Similar gem-bearing clay from the Tourmaline Queen mine at 

 PaMno 90307), shows, in addition to much pink tourmaline large amounts of clay 

 quartz albite, and cookeite, but practically no orthoclase. A gem pocket from the 

 K2 ir., mine, at Pala (no. 90310), shows, in addition to much pink tourma- 

 Hne clay and a\bite, a considerable amoumt of lepidolite, with only a little orthocla^ 

 A 'em pocket from the Pala Chief mine, at Pala (no. 90310), shows considerable gem 

 ku°nzite! with lepidolite, quartz, clay, cookeite, and orthoclase, and smal 1« -mount 

 of albite and muscovite. A similar pocket from the Caterina mine at Pala (no 90311 

 shows only spodumene, pink clay, and quartz. The exhibit also me udee* pocket 

 containing an abundance of small blue tourmalines; a smal pocket fro » be Tour 

 maline K !ng mine, very rich in gem tourmalines; and several pockets free from any 

 gem stones. Such pockets are known by the miners as "dead ones. 



On this same sloping shelf are shown also several large specimens of the minerals 

 associated with the gem pockets. Among these minerals may be noted a fine example 

 o orbtlar muscovite, "an altered perthite (feldspar) crystal, a_ large ^mblygom jte 

 crystal, and several specimens of spodumene (kunzite m ^^-^J^* 

 specimens are very difficult to collect, as in general the matrix of the kunzite is so 

 friable that it breaks to pieces when it is taken out of the mine. 



The three horizontal shelves above the sloping shelf on the north side of th e case con 

 tain w U-developed and well-crystallized specimens of the different mineral, , found 

 in the gem-pocket zone of the pegmatite dikes. Among these ™™f™ £^*£ 

 in particular a good series of the various forms of lepidolite (nos. 88528, 88536) (in 

 cluLg several°well-crystallized specimens) (no. 89865) crystals of —^otel 

 tourmaline crystals (nos. 88165, 88166), albite and orthoclase in we -d ^eloped 

 crvstals pink bervl (no. 89170), stilbite, cassitente, a large crystal of ithiopnilite 

 b ^S, P WuteIte bismu^haerite, purpurite ^Ute a nd pyr^ apat^e 

 pucherite topaz, manganotantalite, a fine example of clear pmk kunzite in the matrix 

 fnos 88538 and 90027)? and the phosphate minerals first found in this locality, namely, 

 palaite, salmonsite, and sicklerite. 



