176 
NON-METALLIC MINEKALS. 
Case K. 
^YLicxTiLii—continued. 
Anhydrous 
lOoo. Orthoclase, or Potash , 
Felspar {^Silicate of Alumina and \ 
Potash), a twin crystal attached to 
Quartz. 
Mourne Mountains, Co. Dorcn, j 
Ireland. 
1056. Orthoclase, detached 
crystal. 
V 
Mourne Mountains. 
1057. Orthoclase, crystallized, 
with Quartz. 
Tintagel, Cornwall. 
1058. Orthoclase, large crys¬ 
tal. 
Swiss Alps. 
1059 and 1060. Orthoclase, 
colourless crystals. 
St. Gotthard, Switzerland. 
1061. Orthoclase, yrith Quartz 
crystals. 
San Pietro, Elba. 
1062. Orthoclase, with Tour¬ 
maline. 
iS. Pietro, Elba. 
1063. Adularia (transparent 
Orthoclase), in crystals. 
Ceylon. 
« 
1064. Adularia, polished slab. 
1065. Moonstones, Adularia 
cut en cabochon. 
Presented by E. G. Hennell. 
1066. Amazon Stone, a green 
variety of Orthoclase. 
Ural Mountains, Siberia. 
1067. Amazon Stone, large 
crystal. 
« 
Siberia. 
(Placed in the case beneath), 
1068. Perthite, a variety of i 
Orthoclase. | 
Perth, Canada. 
Presented by Sir VV. E. Logan. 
1069. Microcline, a variety of 
Orthoclase. 
Egersund, Norway. 
1070. Orthoclase Felspar, 
hemitrope crystals in Mdiich the 
original mineral has been removed 
and replaced by pulverulent mica 
and sand. 
From the porphyritic granite of 
Huel Coates, Cornwall. 
1071. Graphic Granite, a Fel¬ 
spar matrix in which Quartz is 
disposed like the lines in Arabic 
writing. 
Presented by C. J. La Trobe, 
1072. Snuff-box of Graphic 
I Granite. 
1073. Fel spar Porphyry, 
‘•Porfido verde aiitico,'’’ or “Lapis 
Laced^monius ” (Corsi). Twin 
crystals of pale green felspar 
embedded in a darker base. 
1074. Felspar Porphyry, 
j (Eappakivi). 
j Getha Capell, Island of AJ.cind, 
I Finland. 
' 1075. Black Porphyry, with 
I Felspar crystals. 
! Hogland, Finland. 
I Kos. 1074 and 1075 presented b}' M. 
Kordenskioid. 
1076. Snuff-box of Felspar, 
interspersed with particles of 
hornblende, quartz, &c. 
1077. Albite, Tetartin, or 
Cleavelandite, a Soda Felspar 
! {Silicate of Alumina and Soda) ; 
! Avitli Brookite. 
Near Tremadoc, Caernarvonshire. 
1078. Albite. 
Tyrol. 
1079. Albite. 
S ter zing, Tyrol. 
1080. OligoclasE; or Natron- 
spodumene {Silicate of Alumina 
and Soda). 
Arendal, Norivay. 
1081. Sunstone, or Avanturiue 
Felspar, a variety of Oligoclase. 
Arendal, Nonvay. 
