HYPOCHLORITE. 



BB on charcoal, melts easily to a greyish - 

 green opaque glass ; with borax forms a 

 greenish glass. 



Localities. Coverack Cove, near the Li- 

 zard, Cornwall, in serpentine ; the Cucliul- 

 lin Hills, Isle of Skye ; in crystalline con- 

 cretions, of a dark-gi-een or greyish-black 

 colour, and having a strong metallic lustre, 

 in the parish of Termonmaquirk, co. lyrone, 

 in Ireland. The Harz. Greenland. Island 

 af St. Paul, on the coast of Labrador, as a 

 :;onstituent of a syenitic greenstone rock, 

 but chiefly in rolled masses. Canada, with 

 andesite rock, at Chateau Richer, and at 

 St. Adele, Mille Isles. United States, in 

 Essex county, and near Wilmington, Dela- 

 ware. 



Name. From i^^^-i, exceeding, and o-divos, 

 strength ; because it possesses greater lustre 

 md hardness than Hornblende, with which 

 t was formerly confounded. 



Some varieties of Hypersthene have nearly 

 ihe composition of Diallage,to which it bears 

 ;he same relation that the dark varieties 

 jf Pyroxene bear to the paler ones. 



It is sometimes cut for ring-stones and 

 Drooches. 



Brit. Mus., Case 34. 



Hypochlorite, Schiller. Occurs in reni- 

 'orm, botryoidal, and globular masses, with 

 I minute crystalline structure. Colour fee- 

 )le — green, passing into black and yellow. 

 Lyustre resinous and dull. Streak yellowish- 

 >-rev. Brittle. Fracture even to flat con- 

 ihoidal. H. 6. S.G. 2-9 to 3. 



Comp. A mixture of a silicate of bismuth 

 md iron, and a phosphate of alumina. 



Jinnh/sis, by Schuler : 



Silica 50-24 



Alumina .... 14-65 

 Oxide of bismuth . . 13-03 

 Protoxide of iron . . 10-54 



Phosphoric acid . . . .9-62 

 Manganese . . . . trace 



98-08 



BB becomes brown and black, but does 

 lot melt. Insoluble in acids. 



Localities. County of Sayn, in Germany, 

 md in minute crystals and grains, or mas- 

 ive and earthy, at Schneeberg, Johann- 

 jeorgenstadt, and Braiinsdorf, in Saxony. 



Brit. Mus., Case 57. 



Hyposclerite, Breithaupt. Has been 

 hown by Rammelsberg to be probably Al- 

 )ite mixed with Augite. Occurs in crystals 

 Lud lamellar masses, the latter distinguished 

 )y the fracture (which is conchoidal as well 

 IS lamellar) from the rose-coloured Orthose 



IBERITE. 



187 



with which it is associated. 



Colour crreen- 



ish, very similar to that of Oligoclase.^ S.G. 



2-6 to 2-60. 





Analysis, by Rammelsberg : 





Silica .... 



. 67-62 



Alumina 



. 16-59 



Peroxide of iron . 



. 2-30 



Soda .... 



. 10-24 



Lime . . 



. 0-85 



Potash .... 



. 0-51 



Protoxide of manganese 



. 1-46 



99-80 

 Lncality. Arendal, in Norway. 

 Name. From yVo, under (Jess), and <ry.>.Y,eos^ 

 hard. 



Hypostilbite, Beudant. According to 

 Professor Haughton, should be regarded as 

 an altered form of Stilbite. If considered a 

 distinct mineral, it should be regarded as a 

 hydrated lime-Oligoclase, represented by 



the formula Ca Si + Al bi2 + 5H. 

 L^ocality. Faroe. 



Hystatiquk, Breithaupt. A variety of 

 carbonate of lime, the angle of which is 

 107° 28' 30". H. 5-5 to 5-75. S.G. 3-089. 



Hystatisches Eisenerz, Breithaupt; or 

 Hystatite. a variety of titaniferous iron, 

 resembling Ilmenite in colour and cleavage. 

 FL 6. S.G. 5. 



Analysis, by Mosa'nder ; 



Titanic acid . . . .24-19 

 Peroxide of iron . . . 53-01 

 Protoxide of iron . . . 19-91 



Lime 33 



Magnesia . . . .0-68 

 Silica . . . , . 1-17 



99-29 

 Locality. Tvedestrand and Krageroe, near 

 Arendal, in Norway, in gneiss. 



I. 



Iberite, Svanherg. A varietj'- of altered 



lolite, occurring in large six-sided prisms 



with a basal cleavage. Lustre 



vitreous to 



pearly. H. 2-5. S.G. 2-89. 





Analysis, by Norlin : 





Silica .' . 



. 40-90 



Alumina 



. 30-74 



Protoxide of iron . 



. 15-47 



Protoxide of manganese 



. 1-33 



Lime .... 



. 0-40 



Magnesia 



. 0-81 



Potash . . . ^ 



. 4-57 



Soda .... 



. 0-04 



Water .... 



. 5-56 



^9-82 



