G = 3·74. H = 3-3¹⁄₂. Brown to honey yellow; translucent. The Kochelweise, near Schreiberhau, Silesia. _Koppite._ Columbate of E, Ca, Fe, Th, K, Na, etc. Near Pyrochlore (_q.v._). Cer = 4-10; ZrO₂ = 0-5%. Cubic; in dodecahedra. G = 4·45-4·46. H = 5-6. Brown; transparent. Schelingen, Black Forest Mountains, Germany. ~Lanthanite.~ Hydrated carbonate of Cerium metals, especially La; E₂(CO₃)₃,9aq. Cer = 54·9%. Orthorhombic; habit tabular. G = 2·6-2·7. H = 2. White; opaque. With Cerite (_q.v._) at Bastnäs, Sweden; Bethlehem, Pennsylvania, U.S.A. Lavenite. (Mn,Ca,Fe)(ZrOF)Na(SiO₃)₂? ZrO₂ = 28·8-31·6%. Monoclinic; habit prismatic. G = 3·51-3·55. H = 6. Brown to yellow; translucent. Langesund Fiord, Norway; the Ardennes, France. Leucosphenite. BaO,2Na₂O,2(Ti,Zr)O₂,10SiO₂. TiO₂ = 13·2; ZrO₂ = 3·5%. Monoclinic; wedge-shaped. G = 3·05. H = 6¹⁄₂. White; transparent. Narsarsuk, Greenland. Lewisite. 3R´´Sb₂O₆,2R´´TiO₃, where R = Ca, Fe´´ and Mn. TiO₂ = 11-12%. Cubic; in small octahedra. G = 4·95. H = 5¹⁄₂. Yellow to brown; translucent. Tripuhy, Minas Geraes, Brazil. _Loranskite._ Tantalate of E, Zr, Fe, etc. Yttr = 10; Cer = 3; ZrO₂ = 20%. Massive. G = 4·6. H = 5. Black; opaque. Metallic lustre. Finland. Lorenzenite. Titano-silicate of Na and Zr; TiO₂ = 35; ZrO₂ = 12%. Orthorhombic; acicular. G = 3·4. H = 6. Colourless; transparent. South Greenland. _Mackintoshite._ Mixture of oxides, chiefly of Th and U; also Fe, Ca, Mg, Pb, Na, B, Ta, etc. Composition very complex. ThO₂ = 45·3; E₂O₃ = 1·9; ZrO₂ = 1%. Tetragonal, resembling thorite (_q.v._). G = 5·42. H = 5¹⁄₂. Black; opaque. Bluffton, Llano Co., Texas. _Malacone._ An altered Zircon (_q.v._), with E, Ca, Fe, H₂O, etc. ZrO₂ = 47-67%. Tetragonal; pseudomorphous. G = 3·9-4·1. H = 6. Brown, often dull white internally. Hitterö, Norway; Haute Loire, France; and in U.S.A. Mauzeliite. Very similar to Lewisite (_q.v._), with Pb. TiO₂ = 8%. Cubic. G = 5·11. H = 5-6. Brown; translucent. Jakobsberg, Sweden. _Melanocerite._ Very complex fluosilicate of E and Ca, chiefly. Cer = 48; Yttr = 9·2; ThO₂ + ZrO₂ = 2%. Rhombohedral; habit tabular. G = 4·13. H = 5-6. Deep brown to black. Transparent. Langesund Fiord, Norway. _Microlite._ Complex columbate of Ca, E, Fe, etc., with F and H₂O. E₂O₃→ 8%. Cubic; habit octahedral. G = 5·48-5·56. H = 5-5¹⁄₂. Red to yellow. Stockholm, Sweden; Island of Elba; and in U.S.A. Molengraafite. Titano-silicate of Ca, Na, Fe, Al, Mn, etc. TiO₂ = 28%. Monoclinic; in small prisms. Yellow. High refraction and birefringence. Pilandsberg, Transvaal. ~Monazite.~ Phosphate of E, with Th and SiO₂. Cer = 49-74; Yttr = 1-4; ThO₂ = 1-20%. Monoclinic. G = 4·9-5·3. H = 5-5¹⁄₂. Red to brown and yellow; translucent. The Carolinas; Idaho; Brazil; Scandinavia, etc. _Mosandrite._