(Quartz. 157 2. A variety of felfpar has alfo been denominated av anturine. , 3 1 The blood red variety of quartz, which is found 111 Spain, was formerly confidered to be hyacinth. 4> Some varieties of quartz, when burnt, acquire a re ddiflj colour, and are then not unlike avanturine. FIFTH SUBSPECIES. Prafe. Prafem.—Werner. t* ta r em. IVtrti' Cronjl. f. 116 Lauchgriiner quarz, Wid, 3 01 —1’rafium, Kiriv. vol. 1. p. 249—Id. Eflner, • f. 207. Id. Emm. b. i. f. 103.—Quarzo verde di j^ rro > Nap. p. 171.—L a Prafc, Broch. t. 2. p. 252 — V?arz.hyalm verd obfcur, Hauy. External Characters. ^ufuy°^° Ur * S S reen > various degrees of in curs generally maffive, feldom cryftallized. Its