462 PROFESSOR HEDDLE ON 
This unsatisfactory result, or sum total, leaves it much to be desired that 
the mineral should be re-examined ; the more especially as the occurrence of 
ghromite in augitic trap is altogether new. 
TURGITE. 
Found in isolated imbedded cubic crystals, in oar -slate, in the island of 
Kerrera; and also to the east of Oban, These crystals have invariably a hollow 
in their centre ; they are red-brown, and stain the skin of the same colour. 
They yielded— . 
S. G, 3°534, 
Ferric Oxide; ..- °. F ' , 86 * 585 
Lime, : : ae ; ; *818 
Water, : ‘ 3 : z ‘ 5° 559 
Silica, ome ts : : : ; 7° 692 
100° 654 
As unaltered pyrite occurs in the same rock in the vicinity of these crystals, 
they undoubtedly have resulted from the alteration of that mineral ; and this 
may be regarded as a pseudo-pyrite. 
GOTHITE. 
1. Occurs in fibrous reniform masses, the fibres being about an inch and a 
half in length, in veins in the cliffs of the gorge of the Burn of the Sail, in the 
Bring, Hoy, Orkney. | 
Its colour is chocolate-brown, sometimes banded with oe belts ; its 
fibres are very minute ; it is quite similar in appearance, and colour of powder, 
to limonite, but is somewhat harder. 8S. G. 4°13.. . 
‘Ferrie Oxide," § ~.. ° 25 #) gas 
Ferrous Oxide, . ; ‘ poh be ° 054 
‘Manganous Oxide, : ' “ae 
“Maming,"\\S.. ; ; : ‘ 1° 295 
Lime, . : ; , : : : 1° 324 
Water, A katie ’ f ; 10 * 863 
Silica, ars ; : : oe 
100 +031 
The greater part of the silica was insoluble in acid. 
