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Cross Stone. 223 •Both internal and external luftre is Alining, which foretimes inclines to fplendent, fometimes to glif- ten ' n g> and is intermediate between pearly and vi treous. Crofs fraflure uneven and fometiines alfo ftnall c °nchoidal, but in other dire&ions foliated, fragments indeterminately angular- franflucent, palling to tranfparent- Senii-hard, fomewhat more than zeolite*. Eafdy frangible- Not particularly heavy. Specific gravity 2,355 t0 2 >3^r> Kirtuan 2, 353 %fr—2,333, Hauy. \ ' L. Chemical Characters. " Lelievre afierts that it is fufible without addition ,nt0 a white tranfparent glafs, before the blow pipe, ^ther chemifts affirm that it is completely infufible Without addition. It does not form a gelly with acids, an d, according to Hauy, when powdered and thrown ° n charcoal emits a greenifh yellow phofphoric light. * Scratches glafs eafily.—Ham. Constituent