MINERALOGY. 



569 



APPENDIX. 



Appendix. 



Mineral* A0J Characters and place in the Syttem haie 

 not been determined. 



Mi.vutALS of First and Second Classes. 

 1. ALLOPHANE, Stromeyer. 



External Character*. Principal colour blue; also 

 occurs green anil brown. Occurs massive, disseminat- 

 ed, small reniforna, and botryoidal. Externally and in- 

 ternally shining or glistening, and lustre vitreous. 

 Fracture eonchoidal. Transparent, but only translu- 

 cent on the edges in the brown varieties ; semi-hard ; 

 brittle, and uncommonly easily frangible. Specific 

 gravity 1.852 to 1.889, Stromeyer. 



Chemical Characters. It readily gelatinates in acids. 



Corutit. Parts. Water, 

 Silica, 

 Alumina, 

 Lime, 



Sulphate of Lime, 

 Carbonate of Copper, 

 Hydrate of Iron, 



41.301 

 21.922 

 32.202 

 0.730 

 0.517 

 3.058 



0.270100 

 Stromeyer. 



*nottic and Geographic Situation*. Occurs in a 

 bed of ironshot limestone in grey-wacke-slate in the 

 forest of Thuringia. 



2. AMBLYOOMTK, Kreilhanpt. 



External Character* Its colours are greenish-white, 

 pale-mountnin-green, and celandine-green, qnd marked 

 externally with reddi'h and yellowish-brown spots. 

 Occurs massive ; and crystallized in oblique four-sided 

 pritn- ; internally shining and vitreous. Cleavage 

 said to be parallel with the sides of an oblique four- 

 sided prism of 186" KX and 73 W. The fracture un- 

 even. Ranges from translucent to translucent on the 

 edge* ; as hard as felpr ; brittle, aiul easily frangible. 

 Specific gnrrity 8.00, 3.04, Breithaupt. 



Geognottic and Geographic Situation*. It occurs in 

 granite, along with green topaz and tourmaline, near 

 Fenig in Saxony. 



3. APLOME, Haiiy. 



This mineral bat a deep brown or orange-yellow 

 colour. Occurs crystallized in rhomboidal dodecahe- 

 drons, which are so streaked as to point out a hexahe- 

 dral cleavage. In lustre, fracture, and hardness, it 

 grtxi with common garnet, but iu specific gravity is 

 lower, not exceeding 3.444. It is found on the banks 

 of the river Lena in Siberia. 



4. CBICHTOSITE, Jameton. Craitonite, Bournon. 

 External Character*. Colour velvet-black. Occurs 

 crystallized in very acute rhomboid?, with angles of 

 18* and 162*. Externally and internally splendent, and 

 lustre vitreous, inclining to metallic. Cleavage imper- 

 fect. Fracture conchoidal. Opaque. Harder than octa- 

 hedrite. Scratches fluor-spar, but does not affect glass. 

 Sp. gr.=3.0. 



Chemical Character. It is infusible without addition 

 before the blowpipe. 



Coiutit. Parti. /irconia, 46; Silica, 33 ; Alumina, 

 14; Iron, 4; Manganese, 1 ; Loss, 2.= 100. 



Gfognottic *il tuition. It occurs in primitive rocks 

 along with octahedrite, in the diftricts where that mi. 

 neral is found, 

 vou xir. PART ii. 



5. FIBROLITE, Bournon. 



External Cltaracters. Colours white and grey. Oc- Fibrolitc. 

 curs in fibrous concretions, and in oblique prisms of 

 = 100. Internally glistening. Harder than quartz. 

 Sp.gr. = 3.214. 



Geographic Situation It is found in the Carnatic. 

 6. GEHLESITE, Jameson. 



This mineral, named in honour of the late Gehlen, Gehlenite. 

 has not been accurately described. It is said to have 

 a green or grey colour ; to occur crystallized in rec- 

 tangular four-sided prisms, and therefore must belong 

 either to the pyramidal or prismatic series ; it is nearly 

 as hard as felspar, and the specific gravity=2.9, 31. 



Geognuslic and Geographic Situation*. Occurs along 

 with calcareous spar in the valley of Fassa in the Tyrol. 

 7. LIBVRITE, Jameson. Jenite, Hatty. 



External Characters. Colour black, and blackish- Lievrite. 

 green. Occur* massive ; also in distinct concretions, 

 which are small and scopifonn radiated, and in others 

 which arc thin and straight prismatic ; and crystallized 

 in oblique four-sided prisms variously modified by acu- 

 niin;itioii3 and bevclments. Lustre of the fracture 

 glistening and semi-metallic. Fracture uneven. 

 Opaque. Nearly as hard as felspar. Does not change 

 its colour in the streak. Specific gravity 3.825, 4.061, 

 I.tlierre. 



Const. Part*. Silica . 30.0 



Alumina. . 1.0 



Lime . . 14.8 



Oxide of iron 49 



Oxide of manganese 2.0 96.8. I'litiq. 



Geognottic and Geographic Situtalions. Occurs in 

 primitive limestone, along with epidote, quartz .garnet, 

 magnetic ironstone, and crystallized arsenic-pyrites, at 

 Rio la Marine, and Cape Calamite, in the island of El- 

 ba. Said also to occur in Siberia. 



8. SPHAERULITE, Breilhanjit. 



External Character*. Colours brown and grey. Sphicru- 

 Occurs in imbedded roundish balls and grains, which lit*. 

 are sometimes reniformly aggregated; also in stellular 

 fibrous concretions. Externally smooth, (when it has 

 a milky incrustation,) sometimes rough. Internally al- 

 ternates from glimmering to dull. Fracture even and 

 splintery. Opaque, or translucent on the edges. Scratch- 

 es quartz with difficulty. Specific gravity 2.52. 



Clicm. Char. Nearly infusible before the blowpipe. 



Geognottic and Geographic Situations. Occurs in 

 pearlstone and pitchstone-porphyries, where it is often 

 associated with small scales of mica, and portions of fel- 

 spar, in Arran, Saxony, Hungary, and Iceland. 

 <). SKORODITE. Breit/iaupt. 



External Character*. Colours green and brown. 

 Occurs massive and disseminated, but most frequently 

 crystallised, in very short broad rectangular four-sided 

 prisms, acutely acuminated on both extremities, with 

 four planes, which are set on the lateral edges. There 

 is one distinct cleavage parallel with the broader lateral 

 planes of the prism, consequently in the direction f the 

 shorter diagonal of an oblique four-sided prism. Frac- 

 ture intermediate between uneven and conchoidal. 

 Translucent on the edges, or semi-transparent. As hard 

 4 c 



