122 Mr Haidingcr's account of the Specific Gravity 



3. Hut He, a cleavable variety, 4.209 



4. Rut He, the variety in small pebbles called Nigrine from Ohla- 

 pian, Transylvania, 4.249 



5. Rutile, a dark-coloured fragment of a crystal, 4.277 



6. Prismatic Zinc-ore, 5.432 



7. Octahedral Copper-ore, a fragment of a crystal from Chessy, 6.052 



8. Pyramidal Tin-ore, a large crystal from Cornwall, 6.960 



9. Wood Tin, of a hair-brown colour from Cornwall, Hardness 



as 5.0... 5.5. 6.519 



10. Tantalite, from Skogbohle, in the parish of Kimito, Finland, 

 Hardness = 6.0 (equal to that of prismatic Felspar.) Streak be- 

 tween hair-brown and clove-brown, 6.993 



11. Tantalite, another specimen of the same, 7.075 



12. Cerite, from Bastnaes, 4.912 



13. Cerine, from Bastnaes, 4.173 



14. Chrome-ore, massive, the variety from Unst, 4.575 



15. Axotomous Iron-ore, from Gastein, in Salzburg, crystallized, 4.661 



16. Magnetic Iron-ore, octahedrons, imbedded in chlorite, 5.094 



17. Magnetic Iron-ore, octahedrons, imbedded in green talc, 5.128 



18. Magnetic Iron- ore, cleavable masses, with a perfect conchoi- 



dal fracture, engaged in pale green talc, 5.170 



19. Iron-sand, lustre imperfect metallic, fracture perfect con- 

 choidal, 4.872 



20. Titanitic Iron, from Egersund, in Norway, 4.779 



21. Franklinite, 5.091 



22. Rhombohedral Iron-ore, crystals from Elba, 5.229 



23. Rhombohedral Iron-ore, bounded by the face of crystalliza- 

 tion perpendicular to the axis of the crystals, and engaged in quartz. 

 It presents smooth faces of composition, parallel to the faces of the 

 fundamental rhombohedron, which are generally taken for cleavage. 

 From Longbanshyttan, in Sweden, 5.251 



24. Red Hematite, 4.921 



The structure of this variety is very singular. It has a 

 scaly appearance, but each of the particles consists of delicate 

 fibres, diverging from one point, which in all is turned in the 

 same direction. This is also the structure of the variety of 

 prismatic iron-ore called Lepidokrokite, only that, in the lat- 

 ter usually a general tendency remains towards a distribution 

 of the single particles in concentric layers. 



25. Brown Hematite, with crystalline terminations, 3.806 



26. Brown Hematite, 3.922 



27. Stilpnosiderite, 3.611 



28. Lievrite, a crystal, 3.994 



29. Pyramidal Manganese- ore, crystals, 4.722 



4 



