fome Mineral Subjlances. 1 5 
The Derbyffiire and Eckton cauk, which is commonly 
covered with copper marcaffite. 
Ditto from Saxony, which is found growing like 
knobs or protuberances on the yellow phofphoric fpars. 
The [pathum erica forme of Woodward from Derby- 
fhire. 
The flellated fpar, which is found on the Indus hel~ 
niontii from the ifland of Sheppy. 
The fpar from Saxony, refembling lead ore, and which 
by many is fuppofed to be one, called in German Jlangen 
/path. This fpar is by Baron born clalled with the ba- 
faltes; he has no doubt taken it for a fhirl, which is 
claffed with the bafaltes, but I never found them to have 
any affinity. 
Another fpar from Saxony, called alfo Jlangen /path, 
compofed of large interwoven prifms, partly red and 
partly white, and femi-tranfparent. 
Compact femi-tranfparent Auvergne fpar, faid by M. 
monet to contain fulphur; but I could never find an 
atom of it in this or in any of the other fpars I tried, and 
fuppofe his miftake to be owing to a portion of charcoal, 
flame of charcoal, or dull, that got into the crucible. 
Native fulphur is frequently found growing with calca- 
reous fpar and gypfum, but it fliould be confidered as 
heterogeneous. 
Flaky milk-white fpar, found with Cobalt and copper 
ores from Saalfeld. Two 
