402 Scientific Intelligence. (May, 
exhibits one colour when viewed by reflected light, and another 
when seen by transmitted light. Lucas, in the second volume of 
his Tableau des Espaces Minerales, proposes to call it cordierite, on 
the supposition (which is ill founded) that Cordier was the disco- 
verer of it. Karsten gave it the name of zolite, from its violet 
colour. This mineral has hitherto been found only in the kingdom 
of Granada, in Spain, in two places. 1, At Granatillo, near Nijar, 
disseminated in a blue clay contained in green-stone. 2. At the 
bay of St. Pedro, in what Cordier describes as a lava. 
Its colour is violet-blue, approaching to black. Its primitive 
form is a six-sided prism; but it occurs likewise in twelve-sided 
prisms, and in grains. Fracture sometimes imperfectly foliated, 
sometimes imperfectly conchoidal. Lustre, vitreous. Sometimes 
opake ; sometimes translucent on the edges. Specific gravity 2°560. 
Before the blow-pipe it melts, with difficulty, into a greyish-green 
enamel. 
It has been lately analyzed by Gmelin, who found its constituents 
as follows:— 
ie ae Se CEN CA UCKD cull es ae 
Fritts RO Oe hee eer | 
“Magnesia ..ceee eevee eeece aul sh ae 
LADIGR is »'si0 olntele'B’e eeratuch'a ‘sie Une Rh Nan be | 
Oxide of iron ....e0ese08 Sibisits «lac Sividep ene 
Oxide of manganese ....ceeeeeeeenss 17 
101°2 
The mineral from India known by the name of saphir d'eau, 
which has an indigo-blue colour, and the specific gravity of from 
2°555 to 2670, has likewise been analyzed by Gmelin. He found 
its constituents as follows :— 
Silica wee cere seers eens essere a oM cee ee OO 
ANNs se bie’ s foincenipis cone his chee wean nee 
Magnesia .....sesereeeece Setooteecp Lt 
MR a ae fin ies wee ans ioe a ePiveieareie’ e's ts ahs 2-1 
I VOEMEINE /5.'se « w'oys Wechteaa are see 850.4 era el - %4F0 
GAME OF MODs sos 00 oe ce psicen Sa a ae 
Oxide of manganese ........ aceite ha meee 
99°5 
From this analysis it seems to follow that the saphir d’eau is an 
iolite. 
XIII. Blue Mineral from Vesuvius. 
This mineral was first noticed by Breislak, in his Voyages dans la 
Campanie. Bruun Neergaard considered it as a variety of hauyne 
four. de Mines, No. 125); and in Lucas’s Tableau des Espaces 
Minerales, vol. ii. p. 226, it is classed under the species hauyne. 
Its colour is that of ultra-marine, with a shade of grey. Its 
powder has a light blue colour. 
