138 



FERROTANTALITE. 



Analysis of a plumose specimen, by 

 Schnabel : 



Sulphur 

 Arsenic 

 Cobalt . 

 Iron 

 Antimony 



19-98 

 42-53 



8-67 



25-98 



2 84 



100-00 



Ferrotantalite. The name given to a 

 varietj' of Tantalite, in consequence of the 

 large quantity of iron which it contains. 



Ferruginous Phosphate of Manga- 

 nese. See Triplite. 



Ferruginous Quartz, or Iron Flint. 

 A variety of Quartz forming the transi- 

 tion to Jasper. It occurs both massive and 

 in distinct crystals, Avhich are sometimes 

 minute and aggregated into masses like the 

 grains of sand in sandstone, and contains an 

 admixture of about 5 per cent, of iron as 

 red or yellow ochre, or Gothite It is opaque, 

 and of various shades of red, ^^ellow, or 

 blackish-brown. Gives sparks with steel. 



Localities, St. Just and Marazion in 

 Cornwall. Clifton, near Bristol. Stocking 

 Moor, near Glasgow. Dunbar in Hadding- 

 tonshire, in trap. Rathlin Island, N.An- 

 trim. Massive and in minute yellow crys- 

 tals at Benbradagh Hill, Londonderry. (See 

 Eisenkiesel.) 



Brit. Mus., Case 21. 



M. P. G. Horse-shoe Case, Nos. 525, 

 526. 



Ferruginous Silicate of Manganese, 

 Thomson. See Troostite. 



Ferruginous Zinc-spar. The name 

 proposed by Monheim for the light-green 

 varieties of Zinc-spar, rich in zinc. See 

 Kapnite. 



Fetid Carbonate of Lime, Cleavelnnd. 



See SWINESTONE. 



Fetid Sulphate of Barttes, Cle.ave- 

 land. See Hepatite. 



Fettstein, Werner. See El^olite. 



Feuerblende, Br£ithaupt. See Fire- 

 blende. 



Feu EPSTEIN, Werner. See Flint. 



Fibrofkrrite, Prideaux, A variety of 

 Copiapite, found investing Coquimbite. It 

 is warty, separates in scales, and is fibrous 

 in a direction perpendicular to the plane 

 of separation. Colour pale greenish gre}^ 

 affording a yellowish powder. Fibres 

 translucent. Taste rough and somewhat 

 sour. S.G. 2-5 about. 



Comp. 



■f 18H. 



Sesquisulphate of iron or Fe^ fes 



FICHTELITE. 



Analysis, by Prideaux ; 



Peroxide of iron . . . 34-44 

 Sulphuric acid . . . 28-89 

 Water 36-67 



100-00 

 BB on charcoal, decrepitates violently ; 

 emits an odour of sulphur, and leaves 

 peroxide of iron. 



Locality. Chili, South America. 

 Fibrolite, Bonrnon. A fibrous, massive 

 variety of Sillimanite. Colour whitish or 

 greenish-grey, with a lustre approaching to 

 adamantine. The fibres are obliquely tra- 

 ver.'^ed by cracks, and sometimes approach 

 to distinct prisms. Acquires resinous elec- 

 tricity by friction, and emits a reddish phos- 

 phorescent light when two pieces are rubbed 

 together. Rather harder than Quartz, giving 

 sparks with steel. S.G. 3-214. 



Analysis, from the Carnatic, by Chenevix ; 

 Alumina .... 58-25 

 Silica ..... 38-00 

 Iron 0-75 



97-00 



BB infusible. 



Locality. The Carnatic, accompanying 

 Corundum, and as a component part of the 

 granite which is the matrix of the Corun- 

 dum. 



Name. From (?>//3fflv, a fibre, and A.'fo?, 

 stone ; in allusion to its fibrous structure. 



Brit. Mus., Case 26. 



Fibrous Brown Iron Ore. A variety 

 of Brown Hematite. 



Fibrous Gypsum. See Satin*spar. 



Fibrous Quartz. The name given to 

 Quartz possessing a fibrous structure. It is 

 found in Cornwall at Huel Virgin, near 

 Scorrier, and at Tolcarn, near Truro ; at the 

 slate quarries at Bangor, in North Wale« ; 

 in South Stirlingshire at the Campsie Hills, 

 in small fibrous tufts on Heulandite; and 

 in Ireland at Holy Park, near Rathfarn- 

 ham, S. Dublin. A delicate variety occurs at 

 Orange River, near the Cape of Good Hope. 



Fibrous Red Copper-ore, Kirwan. 

 See Chalcotrichite. 



Fibrous Tin: Fibrous Tin Stone, 

 Kirwan. A fibrous and radiated variety of 

 Cassiterite. See Wood-tin. 



FiCHTELiTE, Bromeis. A fossil resin, 

 occurring chiefly in the form of shining 

 transparent scales between the annual rings 

 of growth of a species of pine-tree (Pinites 

 sylvestris), which have separated from one 

 another, or are still looseh' united. The 

 scales form layers (often ^ of an inch thick) 



