Spargelstone* 541 The planes are generally longitudinally ftreaked, iifo finooth. The cryltals are imbedded, and all around cryf- allifed, and are commonly middle fized, and fma Internally its luftre is Ihining, palling into fp en dent, and is vitreous. , Frafture concealed foliated, paffing into uneven, and peifeftly conchoidal,and appears to have a three fold cleavage parallel with the lateral planes, afro a fciall conchoidal crofs fraflure. Fragments indeterminately angulai. Moll frequently tranflucent, and fometimes nearly hanfparent. Semi-hard approaching to foft. Kafily frangible. Brittle. Not particularly heavy. Specific gravity—3»°9^* ! Chemical CharaQers. It difolves in the nitrous acid with effervefcence, bu t does not exhibit a phofphoric light when laid on c oals. a Constituent 4 A