LOWLAND IRON ORE. 



Analysis, by v. Hauer : 



Sulphuric acid . . .52-53 

 Magnesia .... 14-31 

 Soda . . . . . 18-58 

 Peroxide of iron . . . trace 

 Chloride of sodium . . trace 

 Water 14-80 



100-22 



Locality. Ischl, in Austria. 



Lowland Iron Ore, Kirwan. Comprises 

 Morasterz or Morass Ore, Sumpferz or 

 Swamp Ore, and Wiesenerz or Meadow Ore. 

 See Bog-iron Ore. 



Loxoclase, Breithaupt. A variety of 

 Orthoclase, containing a large proportion 

 of soda. Colour vellowish-grey, sometimes 

 bluish. Translucent. H. 7-5 to 7-75. S.G. 

 2-6 to 2-8. 



LYNX SAPPHIRE. 



223 



Comp. RSi+ftSi2, 





Analysis, by Plattner : 





Silica .... 



. 63-50 



Alumina 



. 20-29 



Peroxide of iron . 



. 0-67 



Lime .... 



. . 3-22 



Potash .... 



. 3-03 



Soda .... 



. 8-76 



Magnesia 



. trace 



Hydrofluoric acid 



. 1-23 



100-70 



Locality. Hammond, St. Lawrence co., 

 New York, U. S. 



Name. From Ao|»?, oblique, and xXd-a-i;, 

 cleavage. 



LucHS-sAPPHiRE. See Lynx Sapphire. 



LucuLLiTE. A black marble, first brought 

 to Rome by Lucullus ; it is said from an is- 

 land in the Nile. 



LuDUs Helmontii. From the account 

 of Dr. Woodward, to whom the younger 

 Van Helmont gave an authentic specimen, 

 ■which had formerly belonged to his father, 

 the Ludus would appear to be merely a 

 kind of septaria. Prof. Ferber, writing 

 from Bologna in 1771, also describes the 

 Ludus Helmontii as "cubical marl-stone, 

 ferruminated by calcareous spar-veins, from 

 rio delle maraviglie presso at Martignone sul 

 Bolognese." 



The Ludus of Paracelsus and Dr. Plot 

 was tesselated Pyrites. " 'Twas not a very 

 wild name, Ludus, to be given to a Dye or 

 Talus lusorius, considering how humorous 

 a writer Paracelsus was." {Dr. J. Wood- 

 ward, 1728.) See Waxen-vein. 



Lumachella, Cleaveland, Mohs. LUMA- 

 CHELli, Phillips ; Lumachello. Nicol. A 

 compact limestone, with a dark grey or 



brownish ground, in which are numerous 

 fragments of Ammonites and other fossil 

 shells. These last are sometimes iridescent 

 and reflect green, blue, deep red, and orange 

 tints, in which case it is called Fire 

 llarble. A variety from Astrachan exhibits 

 a beautiful golden yellow light in a reddish- 

 broAvn base. The most common kind is 

 found at Bleiberg, in Carinthia, where it 

 forms the roof of the leail mines. 



Lunaire. See Pierre de Lune. 



Lunnite, Bernhardi. Hydrous phosphate 

 of copper (Phosphochalite), usually in radi- 

 ating fibrous masses, of a beautiful emerald- 

 green colour. 



Lydian Stone, Jameson ; Lydienne, La 

 Metherie; Lydite. A compact variety of 

 flinty slate of a velvet-black colour, and 

 with a flat-conchoidal fracture. 



Localities. — Scotch. Leadhills, in Lanark- 

 shire; Pentland and Moorfoot Hills, near 

 Edinburgh. — Irish. Near Carlow. Glas- 

 dumman in Downshire. — Foreign. The 

 Harz. Saxony, at Hay nichen, near Freyberg. 

 Near Prague and Carlsbad, in Bohemia. 



Name. After the province of Lydia, in 

 Asia Minor, where it is said to have been 

 first found, in the bed of the river Tmolus. 



This stone is used for testing the purity 

 of gold and silver, which is effected by 

 rubbing the metal to be tested upon a 

 polished surface of the stone, the colour of 

 the streak left upon which is sufficient to 

 enable those experienced in its use to judge 

 of the amount of alloy mixed with the 

 gold. The ancients, who employed the 

 stone for the same purpose, called it '^ ^t^H 

 (Lapis Lydius), or Lapis Basanites. 



Brit. Mus., Case 21. 



Lyncurion (^Avyy.v'^iov^, TTieophrastus ; 

 Lapis Lyncurius, Pliny ; A/U? Xocyyovgws^ 

 Epiphanius. A stone used by the ancients 

 for engraving seals on, and believed bj 

 them to be produced from the urine of 

 the Lynx. By some authors, the Lyncurion 

 is supposed to' have been identical with the 

 Amber of the moderns, but the description 

 of the stone given by Theophrastus (1. li. 

 Hi.) does not at all favour this supposition. 

 It is much more probable that the modern 

 Hyacinth was the stone indicated (as was 

 first suggested by Sir John Hill), the stone 

 called vd.y.ivdos, or the Hyacinthus, by the 

 ancients being probably the same as our 

 Amethyst. 



Lyncurium, Valerius. See Schorl, 



Lynx Sapphire, or Luchs Sapphire. 

 A name given to dark greyish- or greenish - 

 blue varieties of Sapphire, as well as to va- 



